inveniosoftware / flask-iiif / 186

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Pull #42

travis-ci

api: proper GIF resize

* Adds custom behaviour for resizing GIF images, as `PIL.Image.resize`
  does not work out-of-the-box (addresses #41).

* Additionally passes `save_all=True` as a keyword arguement on
  `PIL.Image.save` when serving the file over HTTP (addresses #41).

* Bumps `Pillow`'s version to 3.4, where they introduce functionality
  for creating GIF images out of individual frame images.

* Updates tests to cover GIF resizing.

Signed-off-by: Orestis Melkonian <melkon.or@gmail.com>

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