Implement Coinsetter RESTful/JSON API: Ping.
Implement Coinsetter RESTful/JSON API: ClientSession.
Implement Coinsetter RESTful/JSON API: Customer Account.
Implement Coinsetter RESTful/JSON API: Financial Transaction.
Implement Coinsetter RESTful/JSON API: Order.
Implement Coinsetter RESTful/JSON API: Alerts.
Implement Coinsetter RESTful/JSON API: generic service wrapper.
Add javadoc.
Merge pull request #720 from sutra/feature/coinsetter

Implement Coinsetter RESTful/JSON API: ClientSession, Customer Account, Financial Transaction, Order, Alerts and Ping.