Account for new Vimeo iframe usage guidelines
- src="http://player.vimeo.com/video/22439234?api=1" => src="//player.vimeo.com/video/22439234?api=1"
- Backwards-compatible with "original" src style (can remove after confirming http:// not supported)
Update to handle HTTPS as well as HTTP
Merge pull request #4 from juney/handle-http

Support for new Vimeo iframe usage guidelines