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

fixes #3658 - support smart proxy's chef proxy feature

fixes #3752 - move data population from migrations into seed script

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

Fixes #3720 - Add description field to operatingsystem

fixes #3737 - added PXEGrub specific PXE localboot template

fixes #3722 - changed partition tables default names

fixes #3673 - auditing added to ptable w/ test

fixes #3669 - migration: minimize amount of User model exposed to migration

Fixes #3569, #3210 - Use port from foreman_url for templates