* Initial approve / unlock functionality
* Refactor out getdecimal/getbalance. Add in approval limit
* Change validateBalance to shouldValidateBalance
* Add deepEqual and shouldComponentUpdate
* Use web3 toHex util
* Add pending icon and use
* Implement inactive state for Swap CTA
* Disable Swap CTA if not valid
* Have isValid return a bool
* Use mercury gray for inactive CTA
* Check for input/output errors in validSwap
* Create error state for currency input
* Create error functionality for redux
* Add proptypes and convert to float before compare
* Use big number for balance comparison
* wip
* ETH to ERC20 swap input
* ERC20 to ETH swap input
* Add ERC20 to ETH swapInput
* Add ETH to ERC20 swapOutput
* Add ERC20 to ETH swapOutput
* Add ERC20 to ERC20 swapInput
* Add ERC20 to ERC20 swapOutput
* Remove console.log