resolves #488 parse manpage metadata

This one's for you, @skvidal, a man with great and noble purpose.
May you rest in peace knowing you will always be our fellow community member.
resolves #489 output manpage-specific HTML
set docname & outfilesuffix based on manname & manvolnum
Merge pull request #490 from mojavelinux/manpage-html

Parse manpage metadata and output manpage-specific HTML