Add better help message for log_displayer.

Michael requested this. Also, it now looks for start_list.txt
in both the local directory and in ~/robot_code/bin.

Change-Id: Iaa0321de0c32c9f03e301e6bd9eeba44d335938c
diff --git a/aos/linux_code/logging/logging.gyp b/aos/linux_code/logging/logging.gyp
index 52f8b96..65939df 100644
--- a/aos/linux_code/logging/logging.gyp
+++ b/aos/linux_code/logging/logging.gyp
@@ -40,6 +40,7 @@
         '<(AOS)/linux_code/linux_code.gyp:init',
         'binary_log_file',
         '<(AOS)/common/common.gyp:queue_types',
+        '<(AOS)/linux_code/linux_code.gyp:configuration',
       ],
     },
     {