Add currency pairs BTC_LTC and BTC_XRP in order to support Justcoin.
MarketData and Account implementation for Justcoin.
Merge remote-tracking branch 'upstream/develop' into develop

Conflicts:
	xchange-core/src/main/java/com/xeiam/xchange/currency/CurrencyPair.java
Configure BTC_LTC and BTC_XRP Currency Pairs for Justcoin.
Implemented TradeService.  All GET requests are working.  POST an DELETE
requests will work once a fix to the dependency package rescu is added
to support 201 and 204 HTTP response codes.
Added adapter tests.
Added PostCreateResponse to handle returning created order id's.
Merge remote-tracking branch 'upstream/develop' into develop
No longer return Response object from raw api and general cleanup.
Justcoin demos.
Moved ISO Date deserialization and Basic Authentication helper method to
Xchange-core.
Merge remote-tracking branch 'upstream/develop' into develop

Conflicts:
	xchange-examples/pom.xml
Updating Justcoin and Rescu dependency.  The new rescu snapshot is
needed for fix for handling 2xx HTTP response codes other than 200
needed to work with the Justcoin API.
Merge pull request #274 from jamespedwards42/develop

Develop