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

fixes #259 - Ability to search Hosts by Parameters

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 #367 - Parameter validates_format_of is too restrictive

Fixes #261 - parameters now use a single reference_id

This implementation uses STI but the table looks the same for all
variants. This is a little strange but it seems to work.

Also removed obsolete controllers and tests
Added more tests

fixes #302 and all references to_label and to_s
removed references to all per_page settings as they are common now

Fixes #132 - Added a clone operation

This clones the AR, attaches clones of the
originals host_parameters and then renders the "new" action, ready for editing.

The host_parameters must not use validate_presence of :host_id when using nested attributes.
Created a hidden :nested attribute to the form to flag this behaviour...

removing show action in places it doesn't make sense, and minor visual changes

refactored the trailing spaces test and added parameter test

• created an audit show page
• added auditing for external node parameters
  refs #43

Added Groups to puppet classes, now its possible to associate a host with a group of classes
it also allowed to setup parameters per group and override them in the host level

I've done it late at night, so who knows :)

added external nodes parameters support