move demo documents into separate files

demo/docs/textile.textile

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+h1. Textile document
+
+h2. Heading Two
+
+h3. A two-line
+    header
+
+h2. Another two-line
+header
+
+Paragraph:
+one, two,
+thee lines!
+
+p(classone two three). This is a paragraph with classes
+
+p(#id). (one with an id)
+
+p(one two three#my_id). ..classes + id
+
+* Unordered list
+** sublist
+* back again!
+** sublist again..
+
+# ordered
+
+bg. Blockquote!
+    This is a two-list blockquote..!