Use pip instead of apt-get to install django.

Hi,

I've tried your script under ubuntu 12.04 and it was short of working. Since the version of django that ships with the distribution version is 1.3.1 (http://packages.ubuntu.com/search?searchon=names&keywords=python-django), I receive the following error `ImportError: cannot import name python_2_unicode_compatible`.

In order to easily fix this, one can use `pip install django==1.5` which will install the proper version for graphite. This would also require the removal of `apt-get -y install python-django`.