Port subproviders over to mono repo, refactor LedgerSubprovider to no longer rely on hookedWalletSubprovider. Added unit and integration tests.

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+Subproviders
+-----------
+
+A few useful subproviders.
+
+## Installation
+
+```
+npm install @0xproject/subproviders --save
+```
+
+## Subproviders
+
+#### Ledger Nano S subprovider
+
+A subprovider that enables your dApp to send signing requests to a user's Ledger Nano S hardware wallet. These can be requests to sign transactions or messages.
+
+#### Redundant RPC subprovider
+
+A subprovider which attempts to send an RPC call to a list of RPC endpoints sequentially, until one of them returns a successful response.
+
+#### Injected Web3 subprovider
+
+A subprovider that relays all signing related requests to a particular provider (in our case the provider injected onto the web page), while sending all other requests to a different provider (perhaps your own backing Ethereum node or Infura).
+
+### Integration tests
+
+In order to run the integration tests, make sure you have a Ledger Nano S available.
+
+- Plug it into your computer
+- Unlock the device
+- Open the Ethereum app
+- Make sure "browser support" is disabled
+
+Then run:
+
+```
+yarn test:integration
+```