Gfycat embeds don't scale properly

[NiXXeD]

Large/Small gfycat "videos" do not scale properly with the iframe viewport. Gfycat site has non-iframe version of embed code but require a bit more R&D to make use of them with dynamic content like angular.

[boarder2]

I was able to implement this in the Windows app using <video> tags with fallback <source> tags for zippy/fat/giant, etc.

Here's the diff for that change with some other relevant info in the commit.