Children nodes of self

Property definitions

markdown2 $ MdNode :: children
	# Children nodes of `self`
	fun children: Array[MdNode] do
		var nodes = new Array[MdNode]

		var node = first_child
		while node != null do
			nodes.add node
			node = node.next
		end

		return nodes
	end
lib/markdown2/markdown_ast.nit:39,2--50,4