v0.4.3

Fixed

• Currently, one of our dependancy, django-boostrap3, do not support django 1.7 in its last version.
  So there is some detection of the current django installed version in setup.py to pin
  django-boostrap3 to a version supported by django 1.7 if django 1.7 is installed, or to require
  at least django 1.8.
  The detection did not handle the case where django was not installed.
• [PEP8] Put line breaks after binary operator and not before.