Removing the fork banner because it always messes up social media links that try to include images.
Removing prettyPhoto script that doesn't work yet.
Adding prettyPhoto for youtube videos so I don't have to embed them, which really slows down the page when there are several videos. Updated news post and media page to use it.
Merge pull request #240 from rhyolight/remove-fork-banner

Remove fork banner, add prettyPhoto for videos.