python-django: Update to 1.4.11, 1.5.6 and 1.6.3.

This fixes CVE-2014-0472, details can be found at:

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-0472
https://www.djangoproject.com/weblog/2014/apr/21/security/

Signed-off-by: aszlig <aszlig@redmoonstudios.org>