Fixes #6854 - Api status allowed for all users

(cherry picked from commit 7267e023e6db34db8ebb3ba59f4be4b8d0e07624)

fixes #3960 - wrap APIv2 errors in an "error" node

fixes #2248 adds api controllers and actions to access_permissions.rb

Load the apipie documentation when calling '/api'

The documentation is used to list the links for the resources. We make
sure it's loaded.

This commit adds most of the functionality required for API v1

The overall goal was to extract the existing JSON response
overall controllers, and to move them to a seperate name space.

• documentation was added to all requests (available under /apidoc)...

api v1 - render errors with rabl

better detection of permission failure in model
fix ApiConstraints
catch bad routes in api and return json

api v1 - render home#index links from restapi

fixes #1775 - API versioning name space