Fix lint warnings

Fixed warnings:
```md
app/scripts/controllers/computed-balances.js
+ 35:27  warning  Missing space before function parentheses            space-before-function-paren
+ 41:14  warning  'address' is never reassigned. Use 'const' instead   prefer-const
+ 61:9   warning  'updater' is never reassigned. Use 'const' instead   prefer-const
+ 68:11  warning  'newState' is never reassigned. Use 'const' instead  prefer-const

app/scripts/controllers/network.js
+ 104:29  warning  Missing space before function parentheses  space-before-function-paren

app/scripts/lib/createLoggerMiddleware.js
+ 4:32  warning  Missing space before function parentheses      space-before-function-paren
+ 15:2   warning  Newline required at end of file but not found  eol-last

app/scripts/lib/createOriginMiddleware.js
+ 4:32  warning  Missing space before function parentheses      space-before-function-paren
+ 9:2   warning  Newline required at end of file but not found  eol-last

app/scripts/lib/createProviderMiddleware.js
+ 5:34  warning  Missing space before function parentheses      space-before-function-paren
+ 13:2   warning  Newline required at end of file but not found  eol-last

app/scripts/lib/events-proxy.js
+ 1:50  warning  Missing space before function parentheses      space-before-function-paren
+ 31:2   warning  Newline required at end of file but not found  eol-last

app/scripts/lib/nodeify.js
+ 2:22  warning  Missing space before function parentheses  space-before-function-paren
+ 2:24  warning  Missing space before opening brace         space-before-blocks
+ 5:18  warning  Missing space before function parentheses  space-before-function-paren
+ 5:20  warning  Missing space before opening brace         space-before-blocks

app/scripts/lib/pending-balance-calculator.js
+ 16:19  warning  Missing space before function parentheses  space-before-function-paren

app/scripts/lib/pending-tx-tracker.js
+ 85:11  warning  '||' should be placed at the end of the line  operator-linebreak
+ 87:11  warning  '||' should be placed at the end of the line  operator-linebreak
+ 88:11  warning  '||' should be placed at the end of the line  operator-linebreak
+ 90:11  warning  '||' should be placed at the end of the line  operator-linebreak
+ 91:11  warning  '||' should be placed at the end of the line  operator-linebreak

app/scripts/lib/port-stream.js
+ 3:22  warning  Missing space before function parentheses  space-before-function-paren
+ 3:24  warning  Missing space before opening brace         space-before-blocks

app/scripts/lib/tx-gas-utils.js
+ 84:2  warning  Newline required at end of file but not found  eol-last

app/scripts/lib/tx-state-history-helper.js
+ 12:37  warning  Missing space before function parentheses      space-before-function-paren
+ 23:30  warning  Missing space before function parentheses      space-before-function-paren
+ 30:23  warning  Missing space before function parentheses      space-before-function-paren
+ 35:28  warning  Missing space before function parentheses      space-before-function-paren
+ 41:2   warning  Newline required at end of file but not found  eol-last

app/scripts/lib/tx-state-manager.js
+ 94:13  warning  'value' is never reassigned. Use 'const' instead  prefer-const

ui/app/reducers.js
+ 45:7  warning  'state' is never reassigned. Use 'const' instead        prefer-const
+ 53:7  warning  'stateString' is never reassigned. Use 'const' instead  prefer-const

ui/lib/tx-helper.js
+ 27:2  warning  Newline required at end of file but not found  eol-last

ui/app/components/account-dropdowns.js
+ 163:1  warning  More than 2 blank lines not allowed  no-multiple-empty-lines

ui/app/components/menu-droppo.js
+ 22:7  warning  'style' is never reassigned. Use 'const' instead  prefer-const

ui/app/components/shapeshift-form.js
+ 135:11  warning  '&&' should be placed at the end of the line  operator-linebreak

ui/app/components/typed-message-renderer.js
+ 35:25  warning  Missing space before function parentheses      space-before-function-paren
+ 42:2   warning  Newline required at end of file but not found  eol-last

mascara/server/index.js
+ 11:42  warning  Use path.join() or path.resolve() instead of + to create paths  no-path-concat
+ 12:36  warning  Use path.join() or path.resolve() instead of + to create paths  no-path-concat
+ 13:33  warning  Use path.join() or path.resolve() instead of + to create paths  no-path-concat
+ 14:40  warning  Use path.join() or path.resolve() instead of + to create paths  no-path-concat
+ 20:29  warning  Use path.join() or path.resolve() instead of + to create paths  no-path-concat
+ 21:29  warning  Use path.join() or path.resolve() instead of + to create paths  no-path-concat
+ 26:40  warning  Use path.join() or path.resolve() instead of + to create paths  no-path-concat
```

20 files changed, 47 insertions, 49 deletions

diff --git a/app/scripts/controllers/computed-balances.js b/app/scripts/controllers/computed-balances.js
index 9855f715e..907b087cf 100644
--- a/app/scripts/controllers/computed-balances.js
+++ b/app/scripts/controllers/computed-balances.js
@@ -32,13 +32,13 @@ class ComputedbalancesController {
     this.accountTracker.store.subscribe(this.syncAllAccountsFromStore.bind(this))
   }
 
-  syncAllAccountsFromStore(store) {
+  syncAllAccountsFromStore (store) {
     const upstream = Object.keys(store.accounts)
     const balances = Object.keys(this.balances)
     .map(address => this.balances[address])
 
     // Follow new addresses
-    for (let address in balances) {
+    for (const address in balances) {
       this.trackAddressIfNotAlready(address)
     }
 
@@ -58,14 +58,14 @@ class ComputedbalancesController {
   }
 
   trackAddress (address) {
-    let updater = new BalanceController({
+    const updater = new BalanceController({
       address,
       accountTracker: this.accountTracker,
       txController: this.txController,
       blockTracker: this.blockTracker,
     })
     updater.store.subscribe((accountBalance) => {
-      let newState = this.store.getState()
+      const newState = this.store.getState()
       newState.computedBalances[address] = accountBalance
       this.store.updateState(newState)
     })
diff --git a/app/scripts/controllers/network.js b/app/scripts/controllers/network.js
index 0f9db4d53..66cebb842 100644
--- a/app/scripts/controllers/network.js
+++ b/app/scripts/controllers/network.js
@@ -101,7 +101,7 @@ module.exports = class NetworkController extends EventEmitter {
     this.emit('networkDidChange')
   }
 
-  _configureStandardProvider(_providerParams) {
+  _configureStandardProvider (_providerParams) {
     const providerParams = extend(this._baseProviderParams, _providerParams)
     const provider = createMetamaskProvider(providerParams)
     this._setProvider(provider)
diff --git a/app/scripts/lib/createLoggerMiddleware.js b/app/scripts/lib/createLoggerMiddleware.js
index b92a965de..2707cbd9e 100644
--- a/app/scripts/lib/createLoggerMiddleware.js
+++ b/app/scripts/lib/createLoggerMiddleware.js
@@ -1,7 +1,7 @@
 // log rpc activity
 module.exports = createLoggerMiddleware
 
-function createLoggerMiddleware({ origin }) {
+function createLoggerMiddleware ({ origin }) {
   return function loggerMiddleware (req, res, next, end) {
     next((cb) => {
       if (res.error) {
@@ -12,4 +12,4 @@ function createLoggerMiddleware({ origin }) {
       cb()
     })
   }
-}
\ No newline at end of file
+}
diff --git a/app/scripts/lib/createOriginMiddleware.js b/app/scripts/lib/createOriginMiddleware.js
index e1e097cc4..f8bdb2dc2 100644
--- a/app/scripts/lib/createOriginMiddleware.js
+++ b/app/scripts/lib/createOriginMiddleware.js
@@ -1,9 +1,9 @@
 // append dapp origin domain to request
 module.exports = createOriginMiddleware
 
-function createOriginMiddleware({ origin }) {
+function createOriginMiddleware ({ origin }) {
   return function originMiddleware (req, res, next, end) {
     req.origin = origin
     next()
   }
-}
\ No newline at end of file
+}
diff --git a/app/scripts/lib/createProviderMiddleware.js b/app/scripts/lib/createProviderMiddleware.js
index 6dd192411..4e667bac2 100644
--- a/app/scripts/lib/createProviderMiddleware.js
+++ b/app/scripts/lib/createProviderMiddleware.js
@@ -1,8 +1,7 @@
-
 module.exports = createProviderMiddleware
 
 // forward requests to provider
-function createProviderMiddleware({ provider }) {
+function createProviderMiddleware ({ provider }) {
   return (req, res, next, end) => {
     provider.sendAsync(req, (err, _res) => {
       if (err) return end(err)
@@ -10,4 +9,4 @@ function createProviderMiddleware({ provider }) {
       end()
     })
   }
-}
\ No newline at end of file
+}
diff --git a/app/scripts/lib/events-proxy.js b/app/scripts/lib/events-proxy.js
index d1199a278..c0a490b05 100644
--- a/app/scripts/lib/events-proxy.js
+++ b/app/scripts/lib/events-proxy.js
@@ -1,4 +1,4 @@
-module.exports = function createEventEmitterProxy(eventEmitter, listeners) {
+module.exports = function createEventEmitterProxy (eventEmitter, listeners) {
   let target = eventEmitter
   const eventHandlers = listeners || {}
   const proxy = new Proxy({}, {
@@ -28,4 +28,4 @@ module.exports = function createEventEmitterProxy(eventEmitter, listeners) {
   }
   if (listeners) proxy.setTarget(eventEmitter)
   return proxy
-}
\ No newline at end of file
+}
diff --git a/app/scripts/lib/nodeify.js b/app/scripts/lib/nodeify.js
index d24e92206..9b595d93c 100644
--- a/app/scripts/lib/nodeify.js
+++ b/app/scripts/lib/nodeify.js
@@ -1,8 +1,8 @@
 const promiseToCallback = require('promise-to-callback')
-const noop = function(){}
+const noop = function () {}
 
 module.exports = function nodeify (fn, context) {
-  return function(){
+  return function () {
     const args = [].slice.call(arguments)
     const lastArg = args[args.length - 1]
     const lastArgIsCallback = typeof lastArg === 'function'
diff --git a/app/scripts/lib/pending-balance-calculator.js b/app/scripts/lib/pending-balance-calculator.js
index cea642f1a..6ae526463 100644
--- a/app/scripts/lib/pending-balance-calculator.js
+++ b/app/scripts/lib/pending-balance-calculator.js
@@ -13,7 +13,7 @@ class PendingBalanceCalculator {
     this.getNetworkBalance = getBalance
   }
 
-  async getBalance() {
+  async getBalance () {
     const results = await Promise.all([
       this.getNetworkBalance(),
       this.getPendingTransactions(),
diff --git a/app/scripts/lib/pending-tx-tracker.js b/app/scripts/lib/pending-tx-tracker.js
index df504c126..0d7c6a92c 100644
--- a/app/scripts/lib/pending-tx-tracker.js
+++ b/app/scripts/lib/pending-tx-tracker.js
@@ -81,14 +81,14 @@ module.exports = class PendingTransactionTracker extends EventEmitter {
       const errorMessage = err.message.toLowerCase()
       const isKnownTx = (
         // geth
-        errorMessage.includes('replacement transaction underpriced')
-        || errorMessage.includes('known transaction')
+        errorMessage.includes('replacement transaction underpriced') ||
+        errorMessage.includes('known transaction') ||
         // parity
-        || errorMessage.includes('gas price too low to replace')
-        || errorMessage.includes('transaction with the same hash was already imported')
+        errorMessage.includes('gas price too low to replace') ||
+        errorMessage.includes('transaction with the same hash was already imported') ||
         // other
-        || errorMessage.includes('gateway timeout')
-        || errorMessage.includes('nonce too low')
+        errorMessage.includes('gateway timeout') ||
+        errorMessage.includes('nonce too low')
       )
       // ignore resubmit warnings, return early
       if (isKnownTx) return
diff --git a/app/scripts/lib/port-stream.js b/app/scripts/lib/port-stream.js
index 648d88087..a9716fb00 100644
--- a/app/scripts/lib/port-stream.js
+++ b/app/scripts/lib/port-stream.js
@@ -1,6 +1,6 @@
 const Duplex = require('readable-stream').Duplex
 const inherits = require('util').inherits
-const noop = function(){}
+const noop = function () {}
 
 module.exports = PortDuplexStream
 
diff --git a/app/scripts/lib/tx-gas-utils.js b/app/scripts/lib/tx-gas-utils.js
index 41f67e230..7e72ea71d 100644
--- a/app/scripts/lib/tx-gas-utils.js
+++ b/app/scripts/lib/tx-gas-utils.js
@@ -81,4 +81,4 @@ module.exports = class txProvideUtil {
       throw new Error(`Invalid transaction value of ${txParams.value} not a positive number.`)
     }
   }
-}
\ No newline at end of file
+}
diff --git a/app/scripts/lib/tx-state-history-helper.js b/app/scripts/lib/tx-state-history-helper.js
index db6e3bc9f..94c7b6792 100644
--- a/app/scripts/lib/tx-state-history-helper.js
+++ b/app/scripts/lib/tx-state-history-helper.js
@@ -9,7 +9,7 @@ module.exports = {
 }
 
 
-function migrateFromSnapshotsToDiffs(longHistory) {
+function migrateFromSnapshotsToDiffs (longHistory) {
   return (
     longHistory
     // convert non-initial history entries into diffs
@@ -20,22 +20,22 @@ function migrateFromSnapshotsToDiffs(longHistory) {
   )
 }
 
-function generateHistoryEntry(previousState, newState, note) {
+function generateHistoryEntry (previousState, newState, note) {
   const entry = jsonDiffer.compare(previousState, newState)
   // Add a note to the first op, since it breaks if we append it to the entry
   if (note && entry[0]) entry[0].note = note
   return entry
 }
 
-function replayHistory(_shortHistory) {
+function replayHistory (_shortHistory) {
   const shortHistory = clone(_shortHistory)
   return shortHistory.reduce((val, entry) => jsonDiffer.applyPatch(val, entry).newDocument)
 }
 
-function snapshotFromTxMeta(txMeta) {
+function snapshotFromTxMeta (txMeta) {
   // create txMeta snapshot for history
   const snapshot = clone(txMeta)
   // dont include previous history in this snapshot
   delete snapshot.history
   return snapshot
-}
\ No newline at end of file
+}
diff --git a/app/scripts/lib/tx-state-manager.js b/app/scripts/lib/tx-state-manager.js
index 2250403f6..0fd6bed4b 100644
--- a/app/scripts/lib/tx-state-manager.js
+++ b/app/scripts/lib/tx-state-manager.js
@@ -91,7 +91,7 @@ module.exports = class TransactionStateManger extends EventEmitter {
   updateTx (txMeta, note) {
     if (txMeta.txParams) {
       Object.keys(txMeta.txParams).forEach((key) => {
-        let value = txMeta.txParams[key]
+        const value = txMeta.txParams[key]
         if (typeof value !== 'string') console.error(`${key}: ${value} in txParams is not a string`)
         if (!ethUtil.isHexPrefixed(value)) console.error('is not hex prefixed, anything on txParams must be hex prefixed')
       })
diff --git a/mascara/server/index.js b/mascara/server/index.js
index 24739b43f..f0d022f7d 100644
--- a/mascara/server/index.js
+++ b/mascara/server/index.js
@@ -1,3 +1,4 @@
+const path = require('path')
 const express = require('express')
 const createBundle = require('./util').createBundle
 const serveBundle = require('./util').serveBundle
@@ -8,22 +9,22 @@ module.exports = createMetamascaraServer
 function createMetamascaraServer () {
 
   // start bundlers
-  const metamascaraBundle = createBundle(__dirname + '/../src/mascara.js')
-  const proxyBundle = createBundle(__dirname + '/../src/proxy.js')
-  const uiBundle = createBundle(__dirname + '/../src/ui.js')
-  const backgroundBuild = createBundle(__dirname + '/../src/background.js')
+  const metamascaraBundle = createBundle(path.join(__dirname, '/../src/mascara.js'))
+  const proxyBundle = createBundle(path.join(__dirname, '/../src/proxy.js'))
+  const uiBundle = createBundle(path.join(__dirname, '/../src/ui.js'))
+  const backgroundBuild = createBundle(path.join(__dirname, '/../src/background.js'))
 
   // serve bundles
   const server = express()
   // ui window
   serveBundle(server, '/ui.js', uiBundle)
-  server.use(express.static(__dirname + '/../ui/', { setHeaders: (res) => res.set('X-Frame-Options', 'DENY') }))
-  server.use(express.static(__dirname + '/../../dist/chrome'))
+  server.use(express.static(path.join(__dirname, '/../ui/', { setHeaders: (res) => res.set('X-Frame-Options', 'DENY') })))
+  server.use(express.static(path.join(__dirname, '/../../dist/chrome')))
   // metamascara
   serveBundle(server, '/metamascara.js', metamascaraBundle)
   // proxy
   serveBundle(server, '/proxy/proxy.js', proxyBundle)
-  server.use('/proxy/', express.static(__dirname + '/../proxy'))
+  server.use('/proxy/', express.static(path.join(__dirname, '/../proxy')))
   // background
   serveBundle(server, '/background.js', backgroundBuild)
 
diff --git a/ui/app/components/account-dropdowns.js b/ui/app/components/account-dropdowns.js
index 1b46e532a..379e40da7 100644
--- a/ui/app/components/account-dropdowns.js
+++ b/ui/app/components/account-dropdowns.js
@@ -161,8 +161,6 @@ class AccountDropdowns extends Component {
     )
   }
 
-
-
   renderAccountOptions () {
     const { actions } = this.props
     const { optionsMenuActive } = this.state
diff --git a/ui/app/components/menu-droppo.js b/ui/app/components/menu-droppo.js
index 66ab18954..2f173544e 100644
--- a/ui/app/components/menu-droppo.js
+++ b/ui/app/components/menu-droppo.js
@@ -19,7 +19,7 @@ MenuDroppoComponent.prototype.render = function () {
 
   this.manageListeners()
 
-  let style = this.props.style || {}
+  const style = this.props.style || {}
   if (!('position' in style)) {
     style.position = 'fixed'
   }
diff --git a/ui/app/components/shapeshift-form.js b/ui/app/components/shapeshift-form.js
index 901a4a956..c5993e3d3 100644
--- a/ui/app/components/shapeshift-form.js
+++ b/ui/app/components/shapeshift-form.js
@@ -130,9 +130,9 @@ ShapeshiftForm.prototype.renderMain = function () {
         alignItems: 'flex-start',
       },
     }, [
-      this.props.warning
-        ? this.props.warning
-        && h('span.error.flex-center', {
+      this.props.warning ?
+        this.props.warning &&
+        h('span.error.flex-center', {
           style: {
             textAlign: 'center',
             width: '229px',
diff --git a/ui/app/components/typed-message-renderer.js b/ui/app/components/typed-message-renderer.js
index a042b57be..d170d63b7 100644
--- a/ui/app/components/typed-message-renderer.js
+++ b/ui/app/components/typed-message-renderer.js
@@ -32,11 +32,11 @@ TypedMessageRenderer.prototype.render = function () {
   )
 }
 
-function renderTypedData(values) {
+function renderTypedData (values) {
   return values.map(function (value) {
     return h('div', {}, [
       h('strong', {style: {display: 'block', fontWeight: 'bold'}}, String(value.name) + ':'),
       h('div', {}, value.value),
     ])
   })
-}
\ No newline at end of file
+}
diff --git a/ui/app/reducers.js b/ui/app/reducers.js
index 1cded7ca7..e1a890535 100644
--- a/ui/app/reducers.js
+++ b/ui/app/reducers.js
@@ -42,7 +42,7 @@ function rootReducer (state, action) {
 }
 
 window.logState = function () {
-  let state = window.METAMASK_CACHED_LOG_STATE
+  const state = window.METAMASK_CACHED_LOG_STATE
   let version
   try {
     version = global.platform.getVersion()
@@ -50,7 +50,7 @@ window.logState = function () {
     version = 'unable to load version.'
   }
   state.version = version
-  let stateString = JSON.stringify(state, removeSeedWords, 2)
+  const stateString = JSON.stringify(state, removeSeedWords, 2)
   return stateString
 }
 
diff --git a/ui/lib/tx-helper.js b/ui/lib/tx-helper.js
index 341567e2f..de3f00d2d 100644
--- a/ui/lib/tx-helper.js
+++ b/ui/lib/tx-helper.js
@@ -24,4 +24,4 @@ module.exports = function (unapprovedTxs, unapprovedMsgs, personalMsgs, typedMes
   })
 
   return allValues
-}
\ No newline at end of file
+}