The current code is using ```django.contrib.markup``` which was deprecated in 1.5 and removed in 1.6.
Thus we have to stick to 1.5 right now:
```
django==1.5
```
When we want to upgrade to Django 1.6 we might have to remove ```django.contrib.markup``` and use [```docutils```](https://pypi.python.org/pypi/docutils) for reStructuredText.