Fixed library references to use Bower installed packages.

This pull request addresses the following issue:

#88: Don't put libraries in repository, if possible.

All library files are now re-handled by Bower and can be found in the `/public/vendor/` directory. This includes those obtained via CDN as well. Future client-side libraries should follow the same convention. Remember to use `bower install` to install any new Bower packages in your local development after updating your repository.