Only run the tests
Move test_args to tox.ini
Fix doc-strings and github3.login
Add a documented example
Comment the example code

A bit of clarification
Fix tests
Allow for higher versions of pytest
Add example to index

[ci skip]
Fix module doc-string
Split out enterprise support in github3.login

Add github3.enterprise_login
Rename all the iter_(*) methods to \1

- Above regular expression example:

iter_all_users -> all_users