This is how RequireJS loads dependencies at runtime.  The `css!` uses a RequireJS plugin loader to load `css` files as dependencies.

The WebJars stuff defines the mapping for `angular`, `jquery`, and `bootstrap`.

The `css!bootstrap/../../css/bootstrap` thing is kinda nasty.  I think I can clean that up in the WebJar but need to figure out the best way to do that.

In `css!../stylesheets/app` the `../` is needed because this is all relative to the `main.js`.