Added blockquote and span elements
Added the ability to set HTML attributes on tags
Split HTML generator and HTML output module
Began to flesh out HTML output module
Added htmlgenerator.div()
Added paragraph, block quote and todo outputters
Added wrap() method of element "class"
Added outputter for textual variant notation
Added outputter for translater insertions
Added outputter for the subject of a footnote
Added outputter for footnotes