Add Fodoj's name to CONTRIBUTORS
Authorize.net: Fix supported_countries

Changed UK to GB so it matches the country list in active_utils.

Closes #576.
Support ruby 1.8.7 hash syntax.
Merge branch 'master' of github.com:LessonPlanet/active_merchant

* 'master' of github.com:LessonPlanet/active_merchant:
  Support ruby 1.8.7 hash syntax.
  Added support for passing an order_source to Litle authorize and purchase transactions.    * See orderSource in the Litle XML Reference Guide section 4.151
  Added support for passing a credit card OR token to the authorize and purchase methods.   * Note: a token is not a reference (authorization <litleTxnId>) to a previous transaction, but a token representing a credit card. A token is created by the gateway (if configured for tokenization) and returned in either explicit or implicit register token requests.    * Added certification tests defined by the LitleXML Reference Guide section 2.4.4    * Started refactoring the LitleGateway class to match the patterns used by other gateways.