fixes #3768 - API v2 child nodes should not have an object root for each object

fixes #2931 - API v2 hosts JSON response, add *_name for each *_id

fixes #3018 - API v2 metadata for pagination, search, order in index collection json response

fixes #3011 - default root node name for api collections json response to :results but make it configurable

fixes #3510 - plugin interface for registering a plugin, updated menu system

fixes #2763 - correcting doco links

fixes #3017 - split APIv2 controllers from v1 parents

fixes #2810 - more restful API v2 JSON responses in puppetclasses

NOTE: breaking changes to API v2 api/lookup_keys does not exist, replaced by api/smart_variables and api/smart_class_parameters

fixes #3101 - list available images for CRs, add iam_role field to images API

fixes #2989 - missing fields in host API output (API v1 and v2)