Scss and coffee compilation within Web UI

with this pull request one is able to use Sass(scss) Syntax for css and Coffeescript Syntax for js within the backend.

This version is using Sprockets. So you can say

gem 'compass'
gem "bootstrap-sass" 

within you main rails app and use

@import 'compass'
@import 'bootstrap'

within the Locomotive web UI.

You can use local partials too.

e.g. create a 

_import_me.scss 

(no compilation)

and use it with

@import 'import_me'

within the Web UI.

This is tested only for local storage now!