Allow stubs to run if called directly. Kevin Altis requested this.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@23907 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/wx/py/PyShell.py

@@ -9,3 +9,6 @@ from wxPython.py import PyShell
 _rename(globals(), PyShell.__dict__, modulename='py.PyShell')
 del PyShell
 del _rename
+
+if __name__ == '__main__':
+    main()