Fix demos and the test runner for several python/django combinations

Tests passes under:
* Python 2.7 + Django 1.4.10
* Python 2.7 + Django 1.5.5
* Python 3.2 + Django 1.5.5
* Python 3.2 + Django 1.6
Merge branch 'master' of github.com:danirus/django-comments-xtd