Merge pull request #779 from ww3456/develop

TradeHistoryParams changes for Poloniex, Cryptsy and Bitfinex
Balance should contain open orders as well
Add MarketOrder.Builder
[anx] Fix date handling in trade history params
Present timestamp as long in Ticker.toString()
Merge pull request #782 from rafalkrupinski/develop

Add MarketOrder.Builder
Merge pull request #780 from jheusser/itbit_accountfix

ItBit: balance should contain open orders as well
Simplify Bitstamp's cancel order interface
Merge pull request #783 from timmolter/bitstamp-cancel

Simplify Bitstamp's cancel order interface