contrib/win32/hg.bat

--- a/contrib/win32/hg.bat	Thu Jan 22 00:03:58 2015 +0900
+++ b/contrib/win32/hg.bat	Thu Jan 22 00:07:06 2015 +0900
@@ -15,3 +15,5 @@
     python "%~dp0hg" %*
 )
 endlocal
+
+exit /b %ERRORLEVEL%