make web3 connection logic more robust

closes #363

Combine Swap and Send Into 1 Component 

re-invert rates

make slippage parsing more explicit

Merge branch 'combine-swap-send' of https://github.com/ianlapham/uniswap-frontend into ianlapham-combine-swap-send

* fix ens typing error handling

* Add focus styles

* remove periods

* Change copy and button hover state

Merge branch 'beta' of https://github.com/ianlapham/uniswap-frontend into combine-swap-send

* add custom slippage to /swap

* add localstorage support

* remove connect arrow

* invert rates to start

* Refactoring AddLiquidity to make gasLimit computation more clear

* fix suppressClassNameWarning

* remove .md

* update dependencies

* add MLN

closes #367

* add DIP

closes #359

* fix i18n bug

* fix styles

* update with prettier and include env file