move examples to doc directory

--HG--
branch : trunk

doc/example/genxml.py

@@ -0,0 +1,17 @@
+
+import py 
+class ns(py.xml.Namespace): 
+    pass 
+
+doc = ns.books(
+    ns.book(
+        ns.author("May Day"), 
+        ns.title("python for java programmers"),), 
+    ns.book( 
+        ns.author("why", class_="somecssclass"), 
+        ns.title("Java for Python programmers"),),
+    publisher="N.N", 
+    )
+print doc.unicode(indent=2).encode('utf8')
+
+