PermissionsRequiredMixin: Add helper functions for overiding
Subclass PermissionRequiredMixin in MultiPermsRequiredMixin

Allows for better code re-use and overriding of default behavior.
Update docstrings and comments for clarity.
Update doc string
Merge branch 'master' into pr/67
Make it possible to use CanonicalSlugDetailMixin with custom url kwargs
doc updates
SetHeadlineMixin should use force_text
updated changelog and made tests more correct
Added a MessageMixin.
allow ugettext_lazy-wrapped strings for form messages
Merge branch 'master' into pr/67
changelog
docs update
Merge branch 'master' into pr/98
changelog
bump to 1.4.0
adding versions
need to include this
smarter versioning