Add RequireJs Optimizer to have a prod build

How to use

After just do a 'grunt compile' to get your production build.
This command will build your app, add the dependency injection
stuff to our angularjs module and finally a shell call r.js will
done to node_modules/requirejs/bin/r.js to minimize
everything.

The output directory will be src/main/resources/pages

Change-Id: I044c81d9652bd26758fed763475c4ffdd3685f12
Signed-off-by: Maxime Millette-Coulombe <mmcoulombe@inocybe.com>