updates karma requirejs dependency
adds sass support
adds support to importing css bower dependencies

Natively SCSS doesn't support in-place importing of CSS files ( https://github.com/hcatlin/libsass/issues/318 ), but we want to import bower dependencies CSS files into our SCSS files.

The temporary solution ( as suggested by https://github.com/nex3/sass/issues/556#issuecomment-15718564 ) is to copy all the CSS files at the bower_components folder as SCSS files so that we can import them.

The implemented solution also uses a watch to perform this copy task automatically on any dependency changes.
uses normalize-css to demonstrate SCSS support
improves require_config documentation
improves project documentation