Ed/rooms

Changelog
=========
* Create scope var to use in js. ```application.js```
*  Create common css file. ```common_stuff.css.scss```
* Create partial for errors ```_errors.html.haml```
* Add structure for create a room
* Add Action Bar in ```application layout```

[**video**](https://s3.amazonaws.com/uploads.hipchat.com/89325/648614/k0UB86uETn4pZmp/pr-1.ogv)