Refactoring and OAuth Sample Code

- Adding sample code for OAuth calls.
- Refactoring the Ruby wrapper to extract the common object oriented
  code to a new Resource class, which now becomes the parent class of
  all the resource objects.
- Creating a new OAuth class in the Ruby wrapper to handle all OAuth
  calls to the VR2 API.
- Updating the Ruby wrapper config file with the values from the
  production API server.
Updating README with latest additions to the Ruby wrapper