Array2gif

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**Bugfixes**

- Fixed issue where error was raised when non-integer dataset
is used: instead now it is cast to `uint8` and a warning is
raised if there's a difference between the two images.

- Addressed issue where no error is raised when there are
more colors than possible in a GIF (256 max). Although
it is possible to have a separate palette for every
single frame, this is not implemented right now, and
the initial global palette is used for the entire animation.

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**Bugfixes**

- Did not bump version in documentation last times.

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**Bugfixes**

- Fixed issue where the width and height of an image are swapped.
This is clear in image editors but was not obvious when viewed
in Chrome.

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**Improvements**

- It is now possible to use PIL ordering of data (rows x cols x rgb)
in addition to the original ordering (rgb x rows x cols).

**Bugfixes**

- Fixed issue where array2gif would raise ``ValueError`` when using
a 4D NumPy array with perfectly valid data. Now it is possible to
use either a list of 3D NumPy arrays, or a 4D NumPy array for
animated gifs.

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**Initial release**

- One single function, ``write_gif``.