Support GIF files, at least static / single frame

[jonnor]

Looks like it will require work in GEGL, as I do not see any file loaders/savers or it.
Animations will also require some special logic

[forresto]

At that point we could make mp4 and webm versions, like gfycat and twitter,
to save bandwidth and increase quality when the browser can handle it.

http://www.gfycat.com/InbornFearlessAmberpenshell

[jonnor]

Splitting out animation to separste issue
imgflo/imgflo-server#28

[jonnor]

Easiest way may be to create a GdkPixbuf loader/saver, and register it for .gif.
https://developer.gnome.org/gdk-pixbuf/unstable

Or one could port the code over to GEGL, as it has compatible license (LGPLv2+): https://git.gnome.org/browse/gdk-pixbuf/tree/gdk-pixbuf/io-gif.c