Create localizer log replay test

This creates a log replay test that confirms that the localizer can
sanely handle a situation where the drivebase's wheels are spinning. I
used the logfile when working on integrating the IMU into the EKF, and
figured it would be appropriate to test for regressions...

Change-Id: Ib7d5c5412d9e404e165ca99df41940235564b86e
diff --git a/frc971/control_loops/drivetrain/drivetrain.h b/frc971/control_loops/drivetrain/drivetrain.h
index f7924c5..b766db8 100644
--- a/frc971/control_loops/drivetrain/drivetrain.h
+++ b/frc971/control_loops/drivetrain/drivetrain.h
@@ -38,6 +38,8 @@
                           LocalizerInterface *localizer,
                           const ::std::string &name = "/drivetrain");
 
+  virtual ~DrivetrainLoop() {}
+
   int ControllerIndexFromGears();
 
  protected: