Uploaded animated GIFs of 4MB or larger appear very small

[codinghorror (Jeff Atwood)]

@sam

we will no longer be able to optimize animated gifs

I don’t feel we should be doing “optimization” on animated gifs at all, so I think the code needs to detect this. Adding that path would open the door for eventual gif to mp4 video conversion which we want anyway.. eventually. So I feel this is necessary work.