upgrade for pylama 5.0.x

Conflicts:
	tests/views/test_events.py
	tests/views/test_login_social.py
prepared for bumpversion 5.0
updated bumpversion configuration
added test to cover #36 -

- Broken login page when old invalid cookie present
Fix issue where groupfined was returning empty list instead of None when user did not existed
Merge pull request #37 from fizyk/broken_login_invalid_cookie

Broken login invalid cookie - closes #36
Update CHANGES.rst
"Release 0.3.3"
Merge branch 'v0.3'