Add setup

Add a setup file which can be used to import the teams from the
configuration, and create a user (if necessary).  Both options can be
enabled/disabled in the configuration, and the user name and password
can be configured.
Remove unused APIs

Remove the users controller, since it's not used and really isn't
necessary (nor is it very secure).  Remove the import-teams API since
we now have the setup.js script which should be used in it's place.
Update readme

Add the updated information on setup and the UI after the changes made
earlier.