Dynamic Footer, with and without task manager

* The dynamic version of the angular footer is a now part of the task
manager `Grunt`
   * It fully builds the angular footer with `grunt build`. To do so,
it requires the new `app/template` to be also included in the `dist`
directory, which has to be specified in the `Gruntfile.js` file.
   * That’s pretty much all the changes that I have made to make it
work.

The first alone-version `footer-minimal` (independent of task managers)
is also included.