Build hybrid velocity loop for each drivetrain

This provides a way to get to the continuous time drivetrain model from
C++ without doing crazy codegen for all gears.

Change-Id: Iadd7388b74628a94a74ec19efb972fa01efe70c9
diff --git a/motors/seems_reasonable/polydrivetrain.py b/motors/seems_reasonable/polydrivetrain.py
index 4d3720e..a006c67 100644
--- a/motors/seems_reasonable/polydrivetrain.py
+++ b/motors/seems_reasonable/polydrivetrain.py
@@ -19,12 +19,14 @@
 def main(argv):
     if FLAGS.plot:
         polydrivetrain.PlotPolyDrivetrainMotions(drivetrain.kDrivetrain)
-    elif len(argv) != 5:
+    elif len(argv) != 7:
         glog.fatal('Expected .h file name and .cc file name')
     else:
         polydrivetrain.WritePolyDrivetrain(
             argv[1:3],
-            argv[3:5], ['motors', 'seems_reasonable'],
+            argv[3:5],
+            argv[5:7],
+            ['motors', 'seems_reasonable'],
             drivetrain.kDrivetrain,
             scalar_type='float')