Django in versions is no longer 'django' but 'Django'

Hi, 

I have a problem running the recipe. In my project https://github.com/kiberpipa/library/commit/f93cedef3182b9b0af5d76653da55607fba002e7 .

The problem is that I get a version conflict. Because djangorecipe just checks if there is ``django`` but not ``Django``. But in the version file there is just a ``Django`` entry.
Checking for both ``Django`` and ``django`` seems to fix the problem.