inveniosoftware / flask-iiif / 178

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Pull #39

travis-ci

api: proper GIF operations

* Adds custom behaviour for operations on GIF images, as `PIL.Image`
  operations do not work out-of-the-box (i.e. reserve frames).

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

* 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 operations.

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

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