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...

• Remove active scaffold from hosts controller.
• changed default host graphs from one day for up to one week
• added dynamic dropdown boxes for host creation / edit page (e.g. for puppet classes, operating systems etc)....

added links to all facts and switched to url helpers

fixes #208 - use nested_attributes for lookup parameters

fixes #206 - Remove activescaffold from the authentication page

fixes #141 - add support to extlookup kind of queries through foreman
usage:
wget -q -O - "http://foreman/lookup?key=ntpserver&order[]=my.domain&order[]=common"
if you want it in YAML, just add:
wget -q -O - "http://foreman/lookup?key=ntpserver&order[]=my.domain&order[]=common&format=yml"

fixes #173 - redirection loop on login

switches global setting var to be a constant var - refs #100

fixes #89 - this adds basic graphs and charts for your inventory, it
also includes minor changes to the dashboard graphs

Fixes #30 - a very basic version for now - feature requests ARE WELCOMED