CSS/LESS tasks

Resolves issue #3.

Ok, I think it ended up working pretty well.

Added less and css compilation, linting and minification to the pipeline (grunt task).
It now uses bootstrap from bower instead of a local unmanaged copy. Both bootstrap's less and js files are output to the final application build files.

Please review the pull request and then we can update the readme in the main rep.

A pleasure to contribute.