fixes #1576 - api v1 - oauth support

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

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

fixes #1775 - API versioning name space

[refactor] - simple method to display ec2 instance name, instead of using tags everywhere

fixes #1764 changing per_page setting would update only after a restart

this commit changes it back to an area in the code which gets evaluated
everytime instead of upon startup only

Openstack images should show foreman defined images

at least for now as long as we don't support remote
fetching of images

basic openstack support

refs #1589, ensure that vmware public key is automaticilly imported when testing connection