fixes #2033 - Cannot assign a host to an org

Now its possible to change Locations / Organizations only via mass assign

fixes #2138 - Ensure at least one Location / Organization exists

removed the need to add 'btn' class for the action_buttons helper, and changed the action buttons to small.

bootstrap2.2.2

Add organization and location to foreman.

This feature allows foreman to provide multi location, multi tenant and
multi organizations capablities.

the idea is that resources within foreman (e.g. hosts, subnets, users,
environments etc) can belong to one or more locations and organization,...