Create webgl_video_panorama_equirectangular.html

Hello,
here is an example forked from webgl_panorama_equirectangular.html to map video texture instead of a still video. Just add a textures/pano.webm equirectangular video file. I tested it with some material I have, I need to clear the possible copyright issues with the author, let me know if you are interested.
Thank you for your work,
Cheers,
    Beer4duke
added webm equirectangular video from the LHC tunnel. This video can be used publicly.
Merge branch 'patch-1' of https://github.com/beer4duke/three.js into dev
Minor tweaks.