Adding SCSS compile feature without using middleware.

1. Adding support of generating css using grunt tasks
2. Added CSS versioning to the system.

>
You need to setup https://github.com/wwstay/search-frontend.  After
the setup, can you add css versioning to our frontend?  The css is
produced from the scss files.  You need to add a grunt task that does
this and also adds a version number to the final css file (ex -
screen.v1.css).  Additionally, the reference should change in the
referenced jade template file -
https://github.com/wwstay/frontend/blob/master/views/layout.jade.