fixes #5241 - Add support for external user groups.

fixes #812 - new permissions model, user group role and nest support, role filters for better granularity

• Daniel Lobato <elobatocs@gmail.com>
• Joseph Magen <jmagen@redhat.com>
• Tom McKay <thomasmckay@redhat.com>
• Greg Sutcliffe <gsutclif@redhat.com>...

Feature #2368 - form helpers, exceptions and fixes

Feature #2368 - i18n extracting and locale rake task

Feature #2368 - i18n extracting strings

Added gettext calls to the usergroups and roles pages.

Note, this patch does not include an update to the strings file. This will allow patches to be submitted without colliding with each other.
To regenerate the strings file, run rake gettext:find.

WIP rails3 migration

new UI for foreman

added css grid and converted most pages to use that grid

views cleanup and added more operatingsystems icons

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...