Tkinter rename, step 2: fix imports and add stub modules.
diff --git a/Lib/idlelib/GrepDialog.py b/Lib/idlelib/GrepDialog.py
index ab136bc..ccee522 100644
--- a/Lib/idlelib/GrepDialog.py
+++ b/Lib/idlelib/GrepDialog.py
@@ -1,7 +1,7 @@
 import os
 import fnmatch
 import sys
-from Tkinter import *
+from tkinter import *
 import SearchEngine
 from SearchDialogBase import SearchDialogBase