Automatically generate the drivetrain constants.

Change-Id: Ib96f7d55734d44d8ac9d918ec90edf3b1fb46cd3
diff --git a/frc971/control_loops/python/BUILD b/frc971/control_loops/python/BUILD
new file mode 100644
index 0000000..df7d48b
--- /dev/null
+++ b/frc971/control_loops/python/BUILD
@@ -0,0 +1,9 @@
+package(default_visibility = ['//visibility:public'])
+
+py_library(
+  name = 'controls',
+  srcs = [
+    'control_loop.py',
+    'controls.py',
+  ],
+)