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
```

13 files changed, 30 insertions, 31 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')
       })