Fixes #204 - Remove AS from environments page

Merged import facility in Environment and Puppetclass controllers

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...

renamed some variables

corrected typo

environments_controller_test on green

realigned models to use :though and habtm when it made sense, setup basic AS controllers to support that