Removing original Rapleaf code.
Initial commit of MarketoAPI.

Based originally on marketo_gem, but made more like a Ruby project.

- Implements a natively Ruby interface through client proxy objects:
  client.mobjects.list

- Supports most MObject operations, except syncMObjects.
- Includes some Lead operations (getLead, syncLead)
- Includes some Campaign operation
- Includes List operations.

- Allows checking of the client for errors, even through client proxy
  objects.
Implementing tests for MarketoAPI.

- Fixing code bugs and oddities found through the tests.