### Re-implements:
* min/max validators on initial currency swap selection
* polling of order status
* timer that persists across refreshes via localStorage (computed based on `createdTime` and `validFor` amount)
* swap persists across refreshes once order is created.
* various type refactors
### New additions:
* *SimpleButton* (can be PRd separately on request)
* clear loading state after order create (via SimpleButton and font-awesome)
* buffers for non-BTC swaps (bity does not actually accept 0.01 BTC worth of ETH as they claim they do in their JSON response, so a magic number of 10% is added to the minimum).
* add types for swap action creators (and separate out to separate module)
* DRY up swapInformation and onGoingSwapInformation -> SwapInfoHeader.
* stop bity rate loading when Swap will unmount
* split out SimpleDropdown to separate module
* various additional refactors
* README proposal.
* First pass at implementation of proposal on Footer and Header. Footer could use some work.
* Cleanup, and readme additions
* First pass at basic modal
* Modal open / close
* Modal close on esc key.
* Freeze body scrolling when modal is open.
* Use the index bestowed upon me.
* No close on shade click
* Only render children if modal is open. Also, dont show cursor on shade
* Use flexbox for simpler content height / scroll behavior.
* type modal, fix body scroll when mounted opened
* Modal width is sized by content, not hard coded sizes.
* Remove size from flow prop types.
