fixes #470 - Add gpxe scripts support

• dynamic gpxe script that kickstart purly with gpxe - see usage example below
• add static network option to kickstart, ie if added ?static=true to the url, network configuration would be static...

fixes #461 - Newly installed foreman installation creates the admin account without Admin permissions

Fixes #450 - Environment imports lose their puppetclass associations

fixes #457 - LDAP on the fly user creation no longer works

fixes #455 - selected items are not shown as selected

Fixes #456 - After creating or editing a partition table, you get redirect to an invalid page

Fixes #443 - remove unnecassary fact_values loading

This fix does not explain why you need to include :fact_values to
avoid an SQL error. However this includes the fact_values when you do
really need them and does not when you don't

Refactored show_hosts and index...

Restructure the host creation/edit page

This page looks better if the alerts and owner are below the comment box.

fixes #454 - Foreman render 500 instead of 404

• Fixes the not found method
• generalize the find_by_obj_name method so we DRY abit more

refs #168 - optional fields were wrong

When creating a new host and the host was empty then the optional
fields were not shown in the following edit page