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.
Merge branch 'master' of https://github.com/mpdavis/vinz into frontend_server_detail