renamed engine instace to give some clarity
added code to request for user keys when not available
grouped the engine instance together to initialise once
moved hardcoded engine_mocker to test
fixed import path for engine_mocker
added some more funcs to engine_mocker
added data type argument to prompt_user method
added handling code when developer keys not available
modified prompt_user to mock various inputs
added test for each methods seperately
made auth instance associate to twitter class
removed some unwanted codes
removed auth param from get_user_keys
fixed error in method call
fixed error in accessing conf in engine_mocker
fixed redirect_url access error
fixed error accessing mock_input
fixed error in accessing redirect_url
fixed accessing auth in get_user_keys
commented out network access parts of twitter and fixed access to auth in pre_authenticate