added rules to .gitignore for intellij people, added yaml configuration file for user provided API keys, added documentation explaining changes in test procedure casued by added config file, added Receiver and Payment classes for use with the Stripe BTC beta API, added tests for the new Receiver and Payment classes.
added a few notNull tests to the Receiver and Payment classs, added support for the metadata api to the Receiver and Payment classes, added tests of the Receiver and Payment classes metadata api implementation.
changed scope on jackson dependencies to test only