namespace packages first part, fix goto problems

test/namespace_package/ns1/pkg/__init__.py

@@ -1 +1,9 @@
 foo = 'ns1!'
+
+# this is a namespace package
+try
+    import pkg_resources
+    pkg_resources.declare_namespace(__name__)
+except ImportError:
+    import pkgutil
+    __path__ = pkgutil.extend_path(__path__, __name__)