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

fixes #3930 - refactoring of edit_self implementation.

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

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

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

fixes #2741 - rails 3 syntax

fixes #3141: SmartPrpxyAuth no longer calls #render_403 method defined in ApplicationController

fixes #2969 - remove all legacy api code in UI controllers, add deprecation response

fixes #2988 - merge authentication code, enables REMOTE_USER auth on new API controllers

fixes #2877: deletion of the organization or location in the context no longer breaks the session