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>...

fixes #4015 - support oVirt using templates like images

fixes #3912 - add inheritance for locations / organizations

fixes #3939 - add option to 'inherit from parent' for hostgroup attributes

fixes #4234 - cannot edit host's puppet parameters

fixes #3725, #4167 - root password validations, remove default password

fixes #3697, #3701 - more comprehensive field validations

fixes #3099 - Adding parameters to locations and organizations

fixes #3178 - add feature for compute profiles for hostgroups and hosts

fixes #3339 - nested fact support, allow fact importers to be registered by plugins