Add Vimeo album of the talks to the home page.

As we upload videos and add them to the album, folks will be able to see them
from this link. Once all of the talks are uploaded, we can embed them or link to
them from the talk pages if we feel like it.
Merge pull request #44 from burlingtonruby/add_video_album

Add Vimeo album of the talks to the home page.