Improve cancellation of open orders and requesting order history
Merge branch 'develop' into okcoin_cancel
fixes #728
* updated API spec to inculde futuers trade and price examples
#727: include user transaction fees.
Currently implemented for bitfinex, bitstmap, btc central, coinbase (just coinbase fee and no bank fee), cryptsy, kraken, poloniex.
The other exchanges don't send fees together with trade history data (though some do send it in another way).
[Poloniex] access to PoloniexTradeResponse DTO's via raw methods
[Poloniex] use @JsonCreator v. getter/setter to throw http-2xx API errors
[Poloniex] throw PoloniexException on http-5xx API errors
Remove commented out code
[Poloniex] throw PoloniexException as ExchangeException
[coinsetter] Fix locale for parsing dates
Merge pull request #733 from nimrood/develop

[Poloniex] expose trade response DTO; exception handling
Merge pull request #732 from rafalkrupinski/fix/coinsetter-locale

[coinsetter] Fix locale for parsing dates
Merge pull request #730 from jheusser/okcoin_cancel

OkCoin: simpler open order code and improved trade history
#727: Introduce UserTrade
#727: add fees to HitBTC and VaultOfSatoshi user transaction history
#727: introduce and use UserTrades
#727: Use and test UserTrade(s) in tests
Fixed bug in adaptOrderType()

"buy" is not the server response.  It should be "bid".  Otherwise this method always returns OrderType.ASK
Changing trade.streaming.BTCChinaBalance.toString() method to be prettier.

Before, the method printed out a nasty string that prefixed the entire package name like:
com.xeiam.xchange...streaming.BTCChinaBalance@7f374, which is not a useful string.  The method is
now changed to behave like the toString() method in BTCChinaOrder of the same package.
Changing trade.streaming.BTCChinaBalance.toString() method to be prettier.

Before, the method printed out a nasty string that prefixed the entire package name like:
com.xeiam.xchange...streaming.BTCChinaBalance@7f374, which is not a useful string.  The method is
now changed to behave like the toString() method in BTCChinaOrder of the same package.