First draft of Django 1.5 logging configuration.

Django 1.5 compatibility: model field definitions and arguments.

Django 1.5 compatibility: Small typo in log settings.

Django 1.5 compatibility: Stop importing log_settings since we don't use it anymore.

Django 1.5 compatibility: Fix JSON field.

Django compatibility: More model field definitions that got left out of last commit.

Django compatibility: The big one.

Django compatibility: more sumo cleanup.
Django compatibility: Fixes to account for caching and misc tweaks
more django compatibility fixes
update vendor submodule to django 1.4.5 commit