Changed the youtube video links on the landing screen. They play from an
official google account now, instead of Wolff's account.

Also, suppressed the "suggested videos" after videos play. I use
"?rel=0" at the end of the link for this.

Tested: Opened page locally and ensured all links play, and are correct.
Also ensured that the "suggested videos" are suppressed.
Change https links to be http links. GitHub doesn't support https.

Also, modify generate_docs.sh to emit an error if an https link exists.

Tested: by running generate_docs.sh before and after fixing the https
links.

Bug: 12128201
Change-Id: If94f29d57e941e8a54f1a64b9086d0b8b2e60aff
Redo doc changes made directly to the github branch, during launch.

The changes are:
- eliminate mention of Fun Propulsion Group
- change YouTube links on landing page

Ran generate_docs.sh to regenerate the html.

Change-Id: Id261ca43777beacd09a6a1f8458ecc0d59391457
Tested: Looked at new html files in browser.
Merge liquidfun
Merge branch master into gh-pages