Specific Markdown processor to use within Nitdoc

Property definitions

nitc $ DocModel :: md_processor=
	# Specific Markdown processor to use within Nitdoc
	var md_processor: MarkdownProcessor is lazy do
		var parser = new CommandParser(model, mainmodule, modelbuilder, catalog)
		var proc = new CmdMarkdownProcessor(parser)
		proc.decorator = new CmdDecorator(model)
		return proc
	end
src/doc/static/static_base.nit:39,2--45,4