Patched Sanitizer: Added h4, h5, h6 to the whitelist

[GoogleCodeExporter]

sanitizeTag was removing the h4, h5 and h6 because they weren't in the 
`basic_tag_whitelist`, so I added them.

Original issue reported on code.google.com by r...@rodyhaddad.com on 16 May 2013 at 3:35

Attachments:

• Markdown.Sanitizer.js.patch