Add Lyapunov stable controller.

Change-Id: If8635e9e5122705259eb7fd975e4784575f3b3e2
diff --git a/frc971/control_loops/python/BUILD b/frc971/control_loops/python/BUILD
index c0b71f7..2f50468 100644
--- a/frc971/control_loops/python/BUILD
+++ b/frc971/control_loops/python/BUILD
@@ -108,7 +108,7 @@
         "//external:python-gflags",
         "//external:python-glog",
         "//frc971/control_loops/python:controls",
-        "//y2018/control_loops/python:polydrivetrain_lib",
+        "//y2016/control_loops/python:polydrivetrain_lib",
         "@matplotlib",
     ],
 )