added template option for a talk video (use key talk-video in the video.md file). Also added option to embed video from vimeo aside from youtube. Just replace the youtube-id field with vimeo-id.
added template option for a talk video (use key talk-video in the video.md file). Also added option to embed video from vimeo aside from youtube. Just replace the youtube-id field with vimeo-id.

visdesignlab/visdesignlab.github.io,visdesignlab/visdesignlab.github.io,visdesignlab/visdesignlab.github.io