Added control loops for all subsystems and made tests run.

Change-Id: I66542db4355a89f6d24c1ad4772004182197c863
diff --git a/frc971/control_loops/update_arm.sh b/frc971/control_loops/update_arm.sh
new file mode 100755
index 0000000..40ef68a
--- /dev/null
+++ b/frc971/control_loops/update_arm.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+#
+# Updates the arm controllers (for both robots).
+
+cd $(dirname $0)
+
+./python/arm.py fridge/arm_motor_plant.cc \
+    fridge/arm_motor_plant.h