* Improve build speed by using cheap source maps and dropping eslint loader.
* use old 'source-map' on dev when SLOW_BUILD_SPEED env variable exists
* Increase build speed further via caching and DLL
* Cleanup code
* Add step to readme
* Move DLL loader to dev instead of base
* Add post install script
* Revert readme change
* ignore dll dir
### 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).
HenryNguyen5
William O'Beirne
Daniel Ternyak
crptm
Daniel Kaspo