chore(controller): update djangorestframework to 2.4.4

See http://www.django-rest-framework.org/topics/release-notes#24x-series
and https://github.com/tomchristie/django-rest-framework/compare/2.4.3...2.4.4
chore(controller): update South to 1.0.1

See http://south.readthedocs.org/en/latest/releasenotes/1.0.1.html
and https://bitbucket.org/andrewgodwin/south/commits/tag/1.0.1
Merge pull request #2427 from mboersma/update-drf244

chore(controller): update djangorestframework to 2.4.4
Merge pull request #2430 from mboersma/update-south

chore(controller): update South to 1.0.1