Added integral control to the arm.

Change-Id: I866d2749837841f3f8d34e6ffe0e1a0b11c4120e
diff --git a/frc971/control_loops/update_arm.sh b/frc971/control_loops/update_arm.sh
index 40ef68a..c4c1ab9 100755
--- a/frc971/control_loops/update_arm.sh
+++ b/frc971/control_loops/update_arm.sh
@@ -5,4 +5,6 @@
 cd $(dirname $0)
 
 ./python/arm.py fridge/arm_motor_plant.cc \
-    fridge/arm_motor_plant.h
+    fridge/arm_motor_plant.h \
+    fridge/integral_arm_plant.cc \
+    fridge/integral_arm_plant.h