Strip ws from youtube IDs.
The same goes for `{% vimeo %}`.
Mistyped Liquid tag.
Fix hrefs in zoomable_img.
Use {% raw %} tags better, kind of.
Fake it with the PHP lexer.

It at least doesn't mark everything as a comment!
Highlight the rest of those snippets better.
Merge pull request #647 from rackerlabs/dead-link-fixes

Cleaning up dead links