Convert gyro_reading over to event loops.

LPD8806 wasn't going to fit in well, but it's never been used on a
robot.  So take the easy way out and remove it.

Change-Id: Ib4d29b40d63a8663878ff1b074057be8b2df9259
diff --git a/frc971/queues/gyro.q b/frc971/queues/gyro.q
index c86fcab..0885738 100644
--- a/frc971/queues/gyro.q
+++ b/frc971/queues/gyro.q
@@ -1,5 +1,6 @@
 package frc971.sensors;
 
+// Published on ".frc971.sensors.gyro_reading"
 message GyroReading {
 	// Positive is counter-clockwise (Austin says "it's Positive").
 	// Right-hand coordinate system around the Z-axis going up.
@@ -8,7 +9,6 @@
   // The angular velocity in radians/sec
 	double velocity;
 };
-queue GyroReading gyro_reading;
 
 // Published on ".frc971.sensors.gyro_part_id"
 message Uid {