Merge pull request #161 from benehsv/develop

Fixed Bugs in OrderBook.update and added tests for multiple update cases
copied from mtgox
Merge branch 'kraken-polling-marketdata' into kraken-authenticated
Merging
KrakenAuthenticate not working. Problem is probably . Test it with Kraken AccountDemo
Nonce is set to constant for testing.
changed kraken digest, still not working though
Merge pull request #164 from omnibrain/kraken-authenticated

Kraken authenticated
Fixed KrakenDigest
credits to @mmazi
Kraken Trades adpated Json needs to be changed
update BTC-e pairs
correct BTC-e pair and remove CNC
Changed XBTC to XXBT
implemented trades including tests and Demo
Merge remote-tracking branch 'XChange/develop' into kraken-polling-marketdata