* update twitter_endpoints with isListSubscriber and isListMember
instead of having them in twython.py
* app_key and app_secret in place to take over twitter_token and
twitter_secret
* updated methods to have the short hand description show up, should
always be on first line and the description.. not repeating the function
* fixed other method docs and stuff
I still think it's weird to have them, but I'm not against giving the
user more information. I put back in the twitter_http_status_codes
variable, but I changed where the logic was being handled, instead of
it happening the in _request, it will be asserted in Twython error if
an error_code is passed AND the error_code is in
twitter_http_status_codes
