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