Renamed ZeroingEstimator to PotAndIndexPulseZeroingEstimator

Renamed to allow for creating a new interface named ZeroingEstimator
in the future.

Change-Id: I374808cdc39dd4141ea67c81de69bbac98326648
diff --git a/y2016/constants.h b/y2016/constants.h
index a83456c..3cbb895 100644
--- a/y2016/constants.h
+++ b/y2016/constants.h
@@ -11,7 +11,7 @@
 namespace constants {
 
 using ::frc971::constants::ShifterHallEffect;
-using ::frc971::constants::ZeroingConstants;
+using ::frc971::constants::PotAndIndexPulseZeroingConstants;
 
 // Has all of the numbers that change for both robots and makes it easy to
 // retrieve the values for the current one.
@@ -83,19 +83,19 @@
 
   struct Intake {
     double pot_offset;
-    ZeroingConstants zeroing;
+    PotAndIndexPulseZeroingConstants zeroing;
   };
   Intake intake;
 
   struct Shoulder {
     double pot_offset;
-    ZeroingConstants zeroing;
+    PotAndIndexPulseZeroingConstants zeroing;
   };
   Shoulder shoulder;
 
   struct Wrist {
     double pot_offset;
-    ZeroingConstants zeroing;
+    PotAndIndexPulseZeroingConstants zeroing;
   };
   Wrist wrist;