[Kraken] Added base kraken query resposne for querying orders.
Move BTCChinaDepth to OrderBook adapting to BTCChinaAdapters, and add a test case to ensure the asks/bids orders are sorted correctly.
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.
Merge pull request #607 from sutra/develop

Implement BTCChina Data API v1.3: parameter of "limit" for order book API is added.
Fixed Cryptsy getExchangeSymbols

Moved from all public market data to just order book data. Should
resolve out of memory error on phones.
[BTCChina]Added "withdetail" parameters for getOrder.
[BTCChina]Added "since" and "withdetail" parameters for getOrders.
Add comment for BTCChinaOrderDetail.