feat(karma): task proposal

Here comes the **karma/test**  task

:warning: the `bower_components` are required so I removed `.bowerrc`

@mgcrea don't you have a component without dep other that angular for the tests ?
No specifying the minor version looks a bit funny to me, is this some new trend? never seen that kind of short declaration before, I'm not sure I either like/dislike it but it feels a bit awkward at first ;-)