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,...

fixes #1957 - remove old libvirt hypervisors code

Since foreman 1.0 libvirt hypervisors are now part of compute resources
this patch removes the old code and migrate any existing hypervisors to
be libvirt based compute resources.

WIP rails3 migration

Fixes #920 - Add authorization to hypervisor, bookmarks, subnets, smart-proxy/autosign and puppetca

Signed-off-by: Paul Kelly <paul.ian.kelly@googlemail.com>

Fixes #905 - Add :build_host as a separate permission type

Signed-off-by: Paul Kelly <paul.ian.kelly@googlemail.com>

fixes #899 - There are numerous typos and formatting issues with the code

Fixes #263 - Refactored Foreman to use correct singular and pluralization of medium/media

Fixes #366 - Redmine authorization port

This is a major feature which provides RBAC authorization within Foreman
a mental note to myself - never ever work on large commits