Makefile and .spec to build RPM package

Hi guys,
here's a .spec file and a Makefile to help build RPMs for those like me, who don't like to install from PyPI directly.

In the PWD ensure you have the django-ratelimit-$VERSION.tar.gz file and run `make rpm`. The resulting RPMs will be in the current directory.

I've tested the resulting RPM on RHEL6 and it appears to be working correctly.