fixes #302 and all references to_label and to_s
removed references to all per_page settings as they are common now

fixes #271 - remove active scaffold plugin

Fixes #170 - implement usergroups

Added migration
Added tests
Added MVC files
Added the routes as well
Added the program logic and additional views
Added RESTful actions for update and create
Added validations to ensure that usergroup.name and user.login do not collide...