Update requirements

[ci skip]
General cursor (generator) like object for Twython functions

* If the endpoint has an iter_mode, the function is able to be used in
Twython.cursor

* Deprecate Twython.search_gen

Fixes #238
Remove print :blush:
Revert "Update requirements"

This reverts commit 123e023dbb48dd3633845dd8eab94230069326ba.
[ci skip]
Fix generator test, remove search_gen from coverage
Attempting to fix some tests that started breaking...
Fixing up some more tests

Even though this should be done in here really :P
Attempting to fix tests again -___-
Update documentation for cursor example

[ci skip]
Accomedate all endpoints that can be paginated with iter_mode and if needed, iter_key
Merge pull request #241 from ryanmcgrath/dev/cursor

WIP: General cursor (generator) like object for Twython functions, fixes #238