Symbolic icons in app menu -- not ready for F22

[Michael Catanzaro]

On Mon, 2015-04-20 at 22:56 +0200, drago01 wrote:
> > a) Reverting the change to use symbolic icons for the app menu in a
> > downstream patch. This would involve reverting upstream commit [2].

Scratch build: 
http://koji.fedoraproject.org/koji/taskinfo?taskID=9567510

It doesn't look as good as F21 since the icons are shrunken (perhaps a
gnome-shell developer could help with that?), but I propose we go with
this for F22 unless upstream addresses this better.