Even anchors without href should hover with a pointer
Adds bignumber.js
Initial commit of stubbed and ugly trading page

With offer creation and fulfillment, but no order book
Renames takerPays/takerGets to baseCurrency/counterCurrency
Extracts TradingOps and OrderBook helpers from Trading
Clone value in StellarNetwork.amount.encode/decode
Minor styling fix
Re-instate authentication requirement for trading page
Finish the sentence where I talk about
extract offerId
seq should be sequence
Merge pull request #781 from stellar/order-backend-1

Trading Client Backend - Rev 1