Added Python 3.3 to be checked by travis. Fixes #149
remove_perm does not fire post_delete signal is now documented. Fixes #128
Fixed flakes
Simplified migrations test
set usedevelop at tox

this would install package with setup.py develop
Start testing against future Django 1.6 release
Updated Django versions for travis config
Fixed Django 1.6 incompatibility issue.
test to show problem with None object in get_obj_perms
if obj in None, get_obj_perm should return '' and not raise an error
fix test for None in get_obj_perms tempatetag
Removed django-grappelli from travis config
Add Andreas to AUTHORS
Merge pull request #168 from mfa/master

Fix to prevent get_obj_perms templatetag from raising exception when obj=None
Extended docstring for template tag
Merge branch 'pr/168'
Merge pull request #165 from thepapermen/master

Fixed  Issue #164: Shortcuts: get_objects_for_user() is incompatible with Django 1.6
Merge branch 'master' of github.com:lukaszb/django-guardian
Added Ivan to AUTHORS
Django 1.6 dropped support for Python 2.6