figure, figcaption and faster build script

Hi John,

i have improved the build speed, see https://twitter.com/#!/latzt/status/147760036725260288/photo/1

Also, i introduced a semantic element for the video poster: figure and figcaption, see: http://www.w3schools.com/html5/tag_figcaption.asp

You can either pull the new build script or both - it's your choice. 

greetings from berlin :)

Tim