corrected routes DSL

[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 - restapi renamed to apipie

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

added architectures controller in v1 API

api v1 - operatingsystems controller

cleanup after merge conflict with latest develop branch

split api routes to separate routes file

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