Update Twitter Endpoints & Internal Functions

* Twitter Endpoints are now in the order of
https://dev.twitter.com/docs/api/1.1

* No need to repeat search function internally when it is available via
`twitter_endpoints.py`

* Make `searchGen` use self.search, instead of self.get with the full
search url
Merge pull request #155 from michaelhelmick/update-endpoints

Update Twitter Endpoints & Internal Functions, 2.6.0 release