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Syntax highlighting improvements On the server side: During development I would occasionally see SanitizationFilter sanitizing the result of SyntaxHighlightFilter, even though its attributes were whitelisted. This updates the `clean_spans` transformer to return the whitelisted node as [suggested by the Sanitize docs](http://git.io/vZR8i). On the client side: - Makes the syntax_highlight JS more flexible - Adds JS specs - Simplifies highlighting of new notes - Adds highlighting to Markdown preview See merge request !1278