fixes #1576 - api v1 - oauth support

• to use set and enable oauth in settings
• correcting typo

[SQL optimizations] - many small optimizations

• Bookmarks have only users, not usergroups
• added caching to the settings table
• removed notice message lookups (we are not really using those)...

ensures that auto completer for users search works even when you are not an admin

ensure no extra white spaces are added to the provisioning templates editor

Openstack uses username/password.

[API] - minor fixes

- fixed api index action still refering to old restsapi gem
- currently forced apipie to load DSL so we can reuse its DSL in our views

api v1 - Users controller and tests

- split api routes to separate routes file
- better detection of permission failure in model
- fix ApiConstraints
- catch bad routes in api and return json
- render home#index links from restapi
- fixed resource params recognition

api v1 - fixing permissions

cleanups in base controller

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