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ImageMagick does not handle resizing of animated gifs wery well.
Optimized gifs will usually have individual sizes for each frame,
only containing the actually changed image data. Each frame also have
an offset from the origin. When ImageMagick tries to resize such an
image, the offsets gets messed up and the result looks rather terrible.
There's ways to handle this in ImageMagick, by first making all frames
the same size (`convert -coalesce ...`) then resize (`convert -resize
...`) and finally optimize the gif again (`convert -layers Optimize
...`). However, this is a bit too much to handle when trying to download
the animation, so it should be done on or before upload.
For now, I think doing it offline before upload should be good enough.
This _requires_ though, that the animation has the correct dimensions
before upload!
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