[Kraken] Added base kraken query resposne for querying orders.
[ItBit] Adding ItBitBaseResponse for better error handling while placing orders
Error Handling

Added a case for Cryptsy returning nothing
Bitfinex Account Margin Info
Merge pull request #598 from PiotrLadyzynski/develop

[ItBit] Adding ItBitBaseResponse for better error handling while placing...
Merge pull request #599 from kpysniak/kraken

[Kraken] Added base kraken query resposne for querying orders.
Merge pull request #600 from sutra/develop

Move BTCChinaDepth to OrderBook adapting to BTCChinaAdapters
Merge pull request #601 from zholmes1/develop

Cryptsy Error Handling and Bitfinex Margin Account Info
Added darkcoin
Made OrderId a Long
Update CexIOOrder.java
Update CexIOTradeService.java
Merge pull request #606 from Achterhoeker/patch-6

Order id of cexio is to big for an int. Changed to long
Merge pull request #605 from Achterhoeker/patch-5

Added darkcoin
Implement BTCChina Data API v1.3: parameter of "limit" for order book API is added.