Auto skip large gifs.

[octalmage]

Occasionally you'll come across a gif that takes forever to load. I always suspected it was just a huge gif, and now I've confirmed it.

The Giphy API tells you the size of the gif, we should either:

• Auto skip large gifs
• Preview a smaller size and copy the full size to the clipboard.
• Preview a smaller size and copy the smaller size to the clipboard.

[octalmage]

I reopened this, the downsampled gifs are not a great representation of the real gif, but man they're snappy. It would be great to find a nice middle group.

[octalmage]

Reopening this again, this is still a problem. Due to the loading animation we wait until the image is completely finished loading before showing it. See #26 for a potential solution.