Easy-thumbnails

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* Use Django 1.7 migrations. Thanks Trey Hunner.
**Note**: if using South, read the installation docs for required settings
changes.

* Make ThumbnailerImageField.resize_source reflect change in extension.

* Add ``target`` option to the scale_and_crop processor, allowing for image
focal points when cropping (or zooming) an image.

* Add a THUMBNAIL_NAMER option which takes a function used to customize
the thumbnail filename.

* New ``subsampling`` option to reduce color subsampling of JPEG images,
providing sharper color borders for a small increase in file size.

* Reimplementation of the ``thumbnail_cleanup`` command. Thanks Jørgen
Abrahamsen

* More efficient thumbnail default storage. Thanks Sandip Agarwal.

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* Better support for multiple source generators.

* Update method used to check for modification dates of source and thumbnail
images. Thanks Ben Roberts.

* Better thumbnail_high_resolution handling, including the ability to switch on
and off explicitly with a ``HIGH_RESOLUTION`` thumbnail option.

* Added configuration option to specify the infix used for high resolution
image handling.

* Optional postprocessor for image optimization. Thanks Jacob Rief!

* More remote storages optimization

* Thumbnail dimensions can now optionally be cached. Thanks David Novakovic.

* New ``zoom`` option to generate a thumbnail of a source image with a
percentage clipped off each side.

* New ``background`` source processor that can add a border color to ensure
scaled images fit within the exact dimensions given.

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* Considerable speed up for remote storages by reducing queries.
Brent O'Connor spent a lot of time debugging this, so thank you epicserve!

* Allow the ``{% thumbnail %}`` tag to also accept aliases. Thanks Simon Meers!

* Make ``replace_alpha`` actually work correctly.

* Fixes exception being raised when image exists in cache but is doesn't
actually exist in the storage.

* Fixes Python 2.5 compatibility.

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* Some more Django 1.5 fixes.

* Fix an issue with ``Thumbnail.url`` not working correctly.

* Add the ability to generate retina quality thumbnails in addition to the
standard ones (off by default).

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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.