- Location view was updated to use Restful API for data persistence
    - Models validation was updated to handle validation for new separate models
    - Error handler and routes were updated to handle 404 and 500 responses
Merge branch 'master' of github.com:abarinoff/ConfLabs
Fix field access error in StagesController
Merge branch 'master' of github.com:abarinoff/ConfLabs
 - Add validation for the Stages Model
 - Move add/edit/remove Stage listeners setup to the view's events hash
Merge branch 'master' into j00ff/event_manager_refactoring