Simplified UserPagePermissionsProxy.editable_pages method
Return new revision object from Page.save_revision
Cleanup Page.get_latest_revision
Cleanup Page.get_latest_revision_as_page
Make Page.specific and Page.specific_class cached properties
Deprecate Page.get_other_siblings
Added unicode method to PageRevision
Merge pull request #372 from kaedroho/wagtailcore-cleanup-2

Wagtailcore cleanup