Implmented ZeroOuputs function for the drivetrain.

Change-Id: I0e35f34ce3c2d7548775aed20e6596168a806e88
diff --git a/y2014/control_loops/drivetrain/drivetrain_base.cc b/y2014/control_loops/drivetrain/drivetrain_base.cc
index 1176718..2c6d477 100644
--- a/y2014/control_loops/drivetrain/drivetrain_base.cc
+++ b/y2014/control_loops/drivetrain/drivetrain_base.cc
@@ -29,7 +29,8 @@
       constants::GetValues().high_gear_ratio,
       constants::GetValues().low_gear_ratio,
       constants::GetValues().left_drive,
-      constants::GetValues().right_drive};
+      constants::GetValues().right_drive,
+      true};
 
   return kDrivetrainConfig;
 };