Merge pull request #2 from SilentCircle/master

`python-memcached` isn't necessary any more.
Update documentation to accurately reflect how to override get_ip
Adding contributors
bumping version
Set the RATELIMIT_CACHE_BACKEND in settings.py
Bumping version and updating setup to include CONTRIB
Fixing CONTRIBUTORS in MANIFEST
Fix typo
Adding Travis CI config
Moving to .yml
Install using setup.py
Don't support Python2.5 Without some work
Add Build Status Link
Encode unicode for hashlib
Fixing how custom Backends are pickedup
Bump version