Add new unit tests

I added some tests that check generated files (Grunt) with expected files (Component-build()).
I currently use Makefile, to generate expected files, instead of a Grunt task because there are no plugin to run Shell commands compatible with Grunt 4.0. It could be changed later with [Grunt-shell](https://github.com/sindresorhus/grunt-shell) for example.

You just have to run `make` to generate expected files and `grunt` to test.

With this PR, tests are failing because of the outout of the stand-alone version of the component.
Since this commit (35a4ffbac37f941d69288d021e8537f9bebf9780) the `standalone` template is not processed correctly (for testing I've done). I'll patch it in another PR (see #8).