fixes #438 - automatically associate the host domain

This reverts a bahaviour prior to #398, the main difference
is that the domain will not be created, rather only existing
will be used.

Fixes #360, provide a list of hosts which are using a specific puppet class.

this is a quick fix for the original request, created #439 to fulfill the original feature request

Fixes broken links - refs #366

wrong link to domain edit page, refs #366

fix for puppetdoc lookups which do not exists on the filesystem - refs #423

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

Fixes #353 - Added responder for YAML output in HostsController#index

Refactoring Fact_selection action

As of the change in #288, host list can only be seen via
the hosts controller, therefore, moving this method back into the
host controller

Fixes #424 - Added responders for JSON and YAML to DashboardController#index

This is addition fix to ref #423