fixes #812 - new permissions model, user group role and nest support, role filters for better granularity
fixes #3822 - updated Rackspace datacenter list
fixes #2741 - rails 3 syntax
fixes #1923 - matches vms on a compute resource to hosts
Fixes #2833: remove direct endpoints from Rackspace compute resource
Fixes #2832: remove deprecated fog API and rackspace endpoint
fixes #2411 - move STI models in /models and /lib/foreman/models to sub-folders
