Added a SyntaxHighlighter brush for Razor.
Modified ConvertMarkupToValidXhtml so that it no longer uses a regex to pull the content out of the dynamically-created document.
Due to a recent change in admin.js, the post's content is now posted back to the server with extraneous XMLNS attributes. This commit contains code to remove these, utilising the HTML Agility Pack.
Included the HTML Agility Pack.