Fix issue #7

See https://github.com/mishbahr/django-users2/issues/7
Update travis config to exclude python 2.6 for django 1.7
Update travis config
Backport urlsafe_base64_encode/urlsafe_base64_decode to use with djnago 1.5
Backport urlsafe_base64_encode/urlsafe_base64_decode to use with djnago 1.5
Fix get_query_set vs get_queryset for Django <1.6
add 'html coverage report' folder to .gitignore
Sort import orders
Update travis config
Bump version
Merge branch 'master' of https://github.com/mishbahr/django-users2