Fixes #170 - implement usergroups
Added migrationAdded testsAdded MVC filesAdded the routes as wellAdded the program logic and additional viewsAdded RESTful actions for update and createAdded validations to ensure that usergroup.name and user.login do not collide...
removing show action in places it doesn't make sense, and minor visual changes
fixes #201 - Remove activescaffold from the domains page