Replace hashcompat with hashlib

django.utils.hascompat is deprecated. Recommended library is now
Python's built-in hashlib.
Merge branch 'develop'
Merge pull request #3 from HenrikOssipoff/master

Use hashlib instead of deprecated Django library
Add a Bitdeli badge to README
Merge pull request #4 from bitdeli-chef/master

Add a Bitdeli Badge to README
Set version to 1.3 with hashlib