Easy-thumbnails

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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.