Easy-thumbnails

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* Django 1.5 compatibility.

* Fixed a problem with the ``ImageClearableFileInput`` widget.

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* Added a way to avoid generating thumbnails if they don't exist already (with
a signal to deal with them elsewhere).

* Added a ``thumbnailer_passive`` filter to allow templates to use the
non-generating thumbnails functionality when dealing with aliases.

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* Changed the exception to catch from 1.0.2 to IOError.

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* Catch an OSError exception when trying to get the EXIF data of a touchy
image.

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* Fix a Django 1.2 backwards incompatibility in ``easy_thumbnails.conf``

* Introduced a ``thumbnail_created`` signal.

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* Introduction of aliased thumbnails.

* Start of sane versioning numbers.