fixes #2231 - hostgroup deletion is restricted to hostgroups without children

(cherry picked from commit 8c68024ac619121312680ee8afc467857155e71d)

Fixes #4022: Make api puppetrun a PUT for REST standards

(cherry picked from commit bc11c17bcc66fbec3a71be920efa4de32d508ecb)

fixes #3515 - API handles not found objects with 404

(cherry picked from commit 46338cd73c542ecc3aa045b45e831434792c710e)

fixes #3099 - Adding parameters to locations and organizations

fixes #2794 - set api_version and app_info in v1 and v2 base_controllers

fixes #3928 - API v2 - update os_default_templates for operating system

fixes #3930 - refactoring of edit_self implementation.

fixed #3905 - wrong route in apidoc for reports delete (API v2)

fixes #3693 - API v2 - accept GET json format of object in PUT/POST requests to add/remove has_many associations

Fixes #3720 - Add description field to operatingsystem