Add git-number script to calculate generation numbers for commits.

git-number

Index: git-number
diff --git a/git-cl b/git-number
similarity index 67%
copy from git-cl
copy to git-number
index 0fc4354d57830f99f6b9e01cf7381d625ec26436..a441aa90f7ff2b5023b58fc2a1f8fca52b17715c 100755
--- a/git-cl
+++ b/git-number
@@ -1,10 +1,10 @@
 #!/bin/sh
-# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-# git-cl -- a git-command for integrating reviews on Rietveld
-# Copyright (C) 2008 Evan Martin <martine@danga.com>
+# git-number -- a git-command for calculating and displaying the generation
+# number of a commit.
 
 # Test if this script is running under a MSys install.  If it is, we will
 # hardcode the path to Python where possible.
@@ -21,7 +21,7 @@ fi
 # "$base_dir"/update_depot_tools
 
 if [ -d "$base_dir/python_bin" -a $MINGW = 0 ]; then
-  PYTHONDONTWRITEBYTECODE=1 exec "$base_dir/python_bin/python.exe" "$base_dir"/git_cl.py "$@"
+  PYTHONDONTWRITEBYTECODE=1 exec "$base_dir/python_bin/python.exe" "$base_dir"/git_number.py "$@"
 else
-  PYTHONDONTWRITEBYTECODE=1 exec "$base_dir/git_cl.py" "$@"
+  PYTHONDONTWRITEBYTECODE=1 exec "$base_dir/git_number.py" "$@"
 fi