merging and refining examples, also refining skipping documentation.

doc/example/pythoncollection.py

@@ -0,0 +1,11 @@
+
+# run this with $ py.test --collectonly test_collectonly.py
+#
+def test_function():
+    pass
+
+class TestClass:
+    def test_method(self):
+        pass
+    def test_anothermethod(self):
+        pass