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.
Adding ability to get server by hostname
Getting user by email
Adding vinz user to the setup_dev command and pretty printing scan results
Adding support for different remote ports that SSH may be listening on