* Send trades down the DataHandler
When the tradeFeed is enabled, send the trades down the DataHandler
Add TestWSProcessTrades
* Update assertions
* Add check against null references in slices
* Add an error for ws parsing field to common
* Update kraken websocket ProcessTrades
Send individual trades down the DataHandler
Send multiple trades in test
Test error if the trade length is too short
Nits
* Fix nits
