Add support for uniswap.io

[BlinkyStitt]

https://uniswap.io/ looks like Bancor but without a token so it should be possible to add to flash-lending.

[richmcateer]

We're working on this as well as #48 as a part of the release of a more comprehensive lending protocol. Thanks for the suggestions. Feel free to email me at rich@marble.org for more details or with other questions.