Bridgy Publish to Facebook: detect u-video and post video

[tantek]

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

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]

👍 yes!

[snarfed]

one big open question is whether we can post a video by giving the API its URL, like we currently do for photos, or whether we need to upload the file ourselves. the docs say POSTing to /user/video accepts a file_url param, but they also say the source param, which takes the video data as form-encoded, is required. ¯_(ツ)_/¯

if we have to upload the video, that makes this tricky. details.

[snarfed]

never mind. streaming upload is evidently very straightforward.