Updating copy of signup

Per Drew Hicks:

"from Fanatical Support®." -> "from the Fanatical Support® company."
Fixing more and youtube in blog post

- fixes #698
Merge pull request #699 from rackerlabs/gh-698

Fixing more and youtube in blog post
Merge branch 'dev' of https://github.com/rackerlabs/developer.rackspace.com into dev