ANX extraCcyPairs param.  Dynamically update Hitbtc currency pairs. 

ANX:
* Added a couple of raw methods to support getting multiple Tickers/Orderbooks with their new param 'extraCcyPairs' and updated demos.

HitBTC:
* Remove statically configured currency pairs and populate them from the api instead.
* Formatted project and added copyright.
* Added unit tests and demos for Tickers and Orderbooks.