Closer integration in Django model

Django typicaly uses HttpRequest objects in views. It also provides a lot of boilerplate code for data validation and other use full things. Modifying rpc4django to return the same type of HttpRequest object and a QueryDict like a normal POST request would allow the use of django-froms and facilitate the exposition of existing views via RPC limiting code duplication. Also, overriding the HTTP_X_REQUESTED_WITH value to something sensible (rpc4gjango maybe) will allow to build logic in the view to handle being called directly or via RPC