Revert "Add missing GTK2 packages"

This reverts commit 01b898b6784dd379116ae77a24136dac0ebb14fe.
Restore gstreamer-0.10 and GTK2 support

Several activities such as TurtleArt still require GTK2 support.

Selective revert of cc196b6.
Restore gstreamer-0.10 and GTK2 support

Several activities such as TurtleArt still require GTK2 support.

Selective revert of cc196b6.

Rework of dfd0be4.
Use python-simplejson as python-cjson is not here
Add vmeta repository and dependencies

Note that adobe flash plugin won't work without these
dependencies.

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Add tuxmath and tuxpaint dependencies

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Add au2a f20 testing custom repository

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Add art4apps dependencies

These packages are required by Memorize and Story
activities.

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>