add subdirectory and markdown feature, beta and dirty
add markdown.php as a lib ; license is compatible with redistribution as long as the copyright is maintained :
# PHP Markdown
# Copyright (c) 2004-2009 Michel Fortin  
# <http://michelf.com/projects/php-markdown/>
# Original Markdown
# Copyright (c) 2004-2006 John Gruber  
# <http://daringfireball.net/projects/markdown/>