fixes #3658 - support smart proxy's chef proxy feature

fixes #3853 - allow rabl template override to be specified

3853-taxonomy-rabl - changed style of override

fixes #3930 - refactoring of edit_self implementation.

fixes #3280 - authenticate returns true for API requests when login:false

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 #3312 - support /users/extlogin as a login page based on REMOTE_USER

fixes #3577 - do not treat `params[:dryrun]` with value `false` as true

fixes #3550 - correct HTTP method for puppet class import API

fixes #1830 - auto assign puppet proxy if its not defined upon facts/reports event