Bridgy Publish to Twitter: detect u-video and post video tweet

[tantek]

Similar to Bridgy Publish to Twitter u-photo support, Bridgy Publish to Twitter should (before photos) try to detect u-video and if found, post a video tweet to Twitter.

Test post where I'll be trying this (has u-video markup)

http://tantek.com/2015/346/t3/world-of-laughter-tears-hopes-fears

(actually tried to trick Bridgy Publish with u-photo and that was rejected by the silo API calls)

[snarfed]

👍 totally!

[snarfed]

the catch is that it looks like we need to upload the video, ie we can't just provide a URL. that makes this tricky.

[kylewm]

For future reference: videos have to use chunked uploads (The docs don't make that very clear)

[snarfed]

done! woo!