Run tests with Django 1.4.2, as newer django-mptt requires that
Codify req on django >= 1.4.2 for django-mptt requiring that
Merge branch 'master' into next

* master:
  Codify req on django >= 1.4.2 for django-mptt requiring that
  Run tests with Django 1.4.2, as newer django-mptt requires that