Changes 2.3:
* New ``Alias`` namer.
* Avoid a potential concurrency issue with creating the cache.
* Fix incorrect use of select_related for source thumbnail model.
* Removed some vestigal processor arguments.
* Allow ``HIGH_RESOLUTION`` argument on thumbnail template tag.
* Add logic to correctly handle thumbnail images on deferred models (e.g. when using ``.only()``).
* Add a ``data_uri`` filter to allow rendering of an image inline as a data uri.

(adam)