Dropped support for Python 3.2, added 3.4 and Django==1.7

Python 3.2 doesn't have support for u-prefixed strings which makes
targeting both 2.x and Python 3 difficult.

(cherry picked from commit 267f2a860ea00db49451226dcce097cab3c0cf14)
Signed-off-by: Antoine Catton <acatton@fusionbox.com>
Set up the app registry when running tests on django 1.7

(cherry picked from commit 7b3c994758254f16e8f47bf0f13b363d98082f20)
Signed-off-by: Antoine Catton <acatton@fusionbox.com>