fix a bug when import iframe-code from player.vimeo.com

When I'm trying to use this project to build my timeline, I meet this problem: I should log in before playing video in vimeo.com, otherwise the slide will be a "connection reset" one. Trying to use the iframe-code of player.vimeo.com is useless, because the code in google spreadsheet will be parsed as a url to vimeo.com! So I try to move the iframe-if-clause before the vimeo-if-clause, it works fine.
Hope it helps.
By the way, that's really a great project!