fixes #812 - new permissions model, user group role and nest support, role filters for better granularity

• Daniel Lobato <elobatocs@gmail.com>
• Joseph Magen <jmagen@redhat.com>
• Tom McKay <thomasmckay@redhat.com>
• Greg Sutcliffe <gsutclif@redhat.com>...

fixes #4423 - allow puppet classes to be imported by environment

fixes #3912 - add inheritance for locations / organizations

fixes #3920 - prevent 500 ScopedSearch errors on the API, raise UI errors correctly

fixes #3709 - explicitly say puppet environments vs just 'environments'

fixes #2763 - correcting doco links

fixes #2741 - remove dash from -%> to %>

refs #3254 - Using the two-pane layout in some pages.

fixes #2404 - prevents 404 when updating invalid name used as id

Feature #2368 - form helpers, exceptions and fixes