Parse metadata from pandoc title block

Instead of converting directly from the source format to HTML, I changed the module to convert to an intermediate JSON form. This JSON represents Pandoc's Markdown's [abstract syntax tree](http://johnmacfarlane.net/pandoc/scripting.html#json-reader-and-writer). From the JSON I am able to parse out the [title block](http://johnmacfarlane.net/pandoc/demo/example19/Title-block.html). Then I pass the title block information on to the meta variable for the page.