Add video uploader and hosting

[jennie]

• Interface for uploading video
• Third-party encoding to WebM
• Serve video from cloud
• Generate thumbnails

Looking into this service: http://www.heywatchencoding.com/video-encoding-platform

[jennie]

Dropbox is being very finicky about linking directly to videos. And hosting on a Web host is probably not going to be a good long-term solution.

[pretentiousgit]

I hear tell Vimeo is finally... you know. Worth using! It turned up in NPR's t-shirt documentary code, something called Froogaloop.