Update python models to have accurate constants

This should bring the python models all up to date.  Thanks Sarah for
pulling some of these out of the CAD.

Change-Id: I948685629b8d6835dccd72e623bf110525cb4254
diff --git a/frc971/control_loops/python/angular_system.py b/frc971/control_loops/python/angular_system.py
index 36da41a..bd4447b 100755
--- a/frc971/control_loops/python/angular_system.py
+++ b/frc971/control_loops/python/angular_system.py
@@ -22,6 +22,13 @@
                  kalman_q_voltage,
                  kalman_r_position,
                  dt=0.00505):
+        """Constructs an AngularSystemParams object.
+
+        Args:
+          motor: Motor object with the motor constants.
+          G: float, Gear ratio.  Less than 1 means output moves slower than the
+              input.
+        """
         self.name = name
         self.motor = motor
         self.G = G