display 404 with all tried url patterns
p3k exception handling
[docs] explains `with` tag usage in templates
Merge pull request #1027 from Chive/docs/plugin-context

[Docs] plugin reference should cover provided contexts.
fixes #2732
better url resolver
fallback on match with $
fix tests
backwards compapatible mixin classes
removed django trunk from testing
Merge pull request #2755 from digi604/fix-404

display 404 with all tried url patterns
Merge pull request #2761 from digi604/fix-2732

fixes #2732 (language in db but not in CMS_LANGUAGES)
Merge pull request #2760 from mkoistinen/page_url_as_tag

Convert page_url to an AsTag (RTM)
Merge pull request #2765 from mkoistinen/page_url_as_tag

Documentation update for new page_url tag features
fixes issue #1308
remove outdated code
Optimize page permissions checking

  * group__users doesn't exist and it wasn't select_related
  * group__user_set is a one to many, we should use prefetch_related
  * has_permission_membership was still running even if has_perm was
    True
IE8 fixes where Class needs to be refered to window.Class, just apply it to everything
because IE8 wants it that way
use jquery .inArray rather than indexOf (for IE of course)