Describe the repo launch version in `repo version`

  repo version v1.7.8
         (from https://android.googlesource.com/tools/repo.git)
  repo launcher version 1.14
         (from /home/sop/bin/repo)
  git version 1.7.8.rc2.256.gcc761
  Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41)
  [GCC 4.4.3]

Change-Id: Ifcbe5b0e226a1a6ca85455eb62e4da5e9a0f0ca0
diff --git a/subcmds/version.py b/subcmds/version.py
index 83e77d0..03195f8 100644
--- a/subcmds/version.py
+++ b/subcmds/version.py
@@ -19,6 +19,9 @@
 from project import HEAD
 
 class Version(Command, MirrorSafeCommand):
+  wrapper_version = None
+  wrapper_path = None
+
   common = False
   helpSummary = "Display the version of repo"
   helpUsage = """
@@ -31,5 +34,10 @@
 
     print 'repo version %s' % rp.work_git.describe(HEAD)
     print '       (from %s)' % rem.url
+
+    if Version.wrapper_path is not None:
+      print 'repo launcher version %s' % Version.wrapper_version
+      print '       (from %s)' % Version.wrapper_path
+
     print git.version().strip()
     print 'Python %s' % sys.version