No module named builtins

[nickpolet]

Running the ./manage.py qcluster command with python 2.7 gives you an error:

from builtins import range
ImportError: No module named builtins

Looks like the package 'future' is not installed when using pip to install django_q. This issue can be fixed with:

pip install future

Adding 'future' to the install_requires in setup.py should hopefully fix this little issue.

I have created a pull request at #5 to fix this.

[Koed00]

'future' handles the backward compatibility from python 3 to 2. Apparently it is not standard on all environments. Thanks.