FIX #449 js for changing templates
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 'fix-449-js-for-changing-templates' of git://github.com/bmihelac/feincms

* 'fix-449-js-for-changing-templates' of git://github.com/bmihelac/feincms:
  FIX #449 js for changing templates