Parse self as markdown and return the HTML representation

. var md = "Hello World!" var html = md.md_to_html assert html == "

Hello World!

\n"

Property definitions

markdown :: markdown $ String :: md_to_html
	# Parse `self` as markdown and return the HTML representation
	#.
	#    var md = "**Hello World!**"
	#    var html = md.md_to_html
	#    assert html == "<p><strong>Hello World!</strong></p>\n"
	fun md_to_html: Writable do
		var processor = new MarkdownProcessor
		return processor.process(self)
	end
lib/markdown/markdown.nit:2605,2--2613,4