Adding server users endpoint for Jacob
fixing typo get_usernames() --> get_users()
Merge pull request #70 from computmaxer/server_users_endpoint

Adding server users endpoint for Jacob
Adding method to get user by username
Adding users to servers in setup_dev
Merge pull request #71 from mpdavis/scanner

Scanner
Adding a user to a server that is already there will not add it again.
server.get_users() returns a list now instead of a set.
Type-o in docstring
Merge pull request #72 from computmaxer/master

Adding a user to a server that is already there will not add it again.
add a new user
Merge remote-tracking branch 'upstream/master'