* Closed Issue #7 - Option to use a different ActiveRecord class than RestClient

* Closed Issue #7 - Option to use a different ActiveRecord class than RestClient
* This update involves a lot of changes to a lot of files, but the functionality remains the same. The change was to rename RestClient to RestAppClient and rest_client to rest_client. This avoids a conflict with the popular rest-client gem that uses the same RestClient class name.