GNOME goal for 3.8: Python 3

In the last release team meeting we've accepted the Python 3 porting
goal for GNOME 3.8.
https://live.gnome.org/GnomeGoals/Python3Porting

Meaning: During development phase of GNOME 3.8 (3.7.x) we will depend on
Python 3.

Maintainers/developers: Please visit above URL and assist with the
porting. If as module owner you want to still support Python 2 as well
as Python 3 that is at your discretion.

Distributions: Please check what impacts this has on your tools. Please
notify about impact or required assistance on
desktop-devel-list@... Please assume that all modules will *only*
support Python 3.

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Regards,
Olav