Merge branch 'development' into feature/portal-ledger-support

* development: (437 commits)
  Publish
  Update yarn.lock
  Update the CHANGELOG
  Fix the bug making it impossible to specify the custom ZRX address
  Fix fill/cancel order by looking for NoError instead of empty blockchainErr given the BlockchainErrs type refactor
  Add a comment about a yarn bug
  Add our mainnet and kovan nodes as backups for Portal requests
  Fix bug hiding the user info from topBar
  Add dev-utils package to top level README
  Prettier newline
  Prettier
  Allow Token symbols to be alphanumeric
  Update CHANGELOG, rebase on development
  Should not -> cannot
  Reject negative amounts in isValidBaseUnitAmount
  Re-add changelog for 0x.js
  Fix prettier
  Update yarn.lock
  Move tests to a separate folder
  Change file layout
  ...

# Conflicts:
#	packages/website/README.md

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+## @0xproject/kovan_faucets
+
+This faucet dispenses 0.1 test ether to one recipient per second and 0.1 test ZRX every 5 seconds. It has a max queue size of 1000.
+
+## Installation
+
+This is a private package and therefore is not published to npm. In order to build and run this package locally, see the [Install Dependencies](#Install-Dependencies) section and onwards below.
+
+## Contributing
+
+We strongly recommend that the community help us make improvements and determine the future direction of the protocol. To report bugs within this package, please create an issue in this repository.
+
+Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
+
+### Install Dependencies
+
+If you don't have yarn workspaces enabled (Yarn < v1.0) - enable them:
+
+```bash
+yarn config set workspaces-experimental true
+```
+
+Then install dependencies
+
+```bash
+yarn install
+```
+
+### Start
+
+Set the following environment variables:
+
+```bash
+export FAUCET_ENVIRONMENT=development
+export DISPENSER_ADDRESS=0x5409ed021d9299bf6814279a6a1411a7e866a631
+export DISPENSER_PRIVATE_KEY=f2f48ee19680706196e2e339e5da3491186e0c4c5030670656b0e0164837257d
+export FAUCET_ROLLBAR_ACCESS_KEY={GET_THIS_FROM_ROLLBAR_ACCOUNT_SETTINGS}
+export INFURA_API_KEY={GET_THIS_FROM_INFURA}
+```
+
+Infura API Key can be requested here: https://infura.io/register.html
+
+Note: The above public/private keys exist when running `testrpc` with the following option `--mnemonic concert load couple harbor equip island argue ramp clarify fence smart topic`.
+
+```bash
+yarn dev
+```
+
+### Endpoints
+
+`GET /ether/:recipient`
+
+Where recipient_address is a hex encoded Ethereum address prefixed with `0x`.
+
+`GET /zrx/:recipient`
+
+Where recipient_address is a hex encoded Ethereum address prefixed with `0x`.
+
+### Docker configs
+
+```
+docker run -d \
+-p 80:3000 \
+--name kovan-faucets \
+--log-opt max-size=100m \
+--log-opt max-file=20 \
+-e DISPENSER_ADDRESS=$DISPENSER_ADDRESS \
+-e DISPENSER_PRIVATE_KEY=$DISPENSER_PRIVATE_KEY \
+-e FAUCET_ROLLBAR_ACCESS_KEY=$FAUCET_ROLLBAR_ACCESS_KEY \
+-e FAUCET_ENVIRONMENT=production \
+kovan-faucets
+```
+
+### Lint
+
+```bash
+yarn lint
+```