Adds the sensor unwrap class and tests.

Added the Reset function call to the constructor. Cleaned up some comments.

Change-Id: Ib6bc3cacfe586890b7294f11a1a721a14fd0f989
diff --git a/y2018/control_loops/superstructure/superstructure_status.fbs b/y2018/control_loops/superstructure/superstructure_status.fbs
index af2d1ab..8baf40e 100644
--- a/y2018/control_loops/superstructure/superstructure_status.fbs
+++ b/y2018/control_loops/superstructure/superstructure_status.fbs
@@ -16,6 +16,8 @@
   spring_position:float;
   // Estimated velocity of the spring in units/second.
   spring_velocity:float;
+  // Reported wrapping of the spring
+  spring_wrapped:int;
 
   // Estimated position of the joint.
   motor_position:float;