Made Velocity Shooter loop such that it should run.

Currently, all it builds and passes all the tests. I need to go in and check to see if there are any more tests I should add.
diff --git a/bot3/control_loops/shooter/shooter.h b/bot3/control_loops/shooter/shooter.h
index efc1f1b..ac7aadd 100644
--- a/bot3/control_loops/shooter/shooter.h
+++ b/bot3/control_loops/shooter/shooter.h
@@ -40,6 +40,8 @@
   // For making sure it keeps spinning if we're shooting.
   double last_velocity_goal_;
 
+  Eigen::Matrix<double, 1, 1> U_add;
+
   DISALLOW_COPY_AND_ASSIGN(ShooterMotor);
 };