Update the HTML with the new img filenames in meta tags.

Sometimes there are links to images in the meta tags, such as facebook
open graph meta tag `<meta property="og:image" content="http://facebook.combanner.png"/>`.
Fix previous patch.

It's `meta content` not `meta src`.
Add test case for meta content replacement.
Merge pull request #356 from yeoman/meta-replace

Meta replace
Add JSCS support.

Also move style checks from JSHint to JSCS.
Fix JSCS issues and make everything more readable and consistent.