Added s setup module to make it easier to test the sample modules.

Doc/ext/setup.py

+from distutils.core import setup, Extension
+setup(name="noddy", version="1.0",
+      ext_modules=[
+         Extension("noddy", ["noddy.c"]),
+         Extension("noddy2", ["noddy2.c"]),
+         Extension("noddy3", ["noddy3.c"]),
+         ])
+