Removed "SetSuccessUrlMixin" class from "core.views".
Improved "SetCancelUrlMixin" class.
Fixed cancel urls in some views.
Author perms are now set only on model instance creation.
Removed duplicated messages snippet.
Fixed success url on bookmark update and deletion.
Added meta title to index page.
Added mixin to support filtering in model list views.
Added support for paginating to model list.
Improved utility "replace_path_arg" (and renamed to "set_path_kwargs").