Moved DrivetrainWriter from y2014_bot3

Change-Id: I9d4cc47d06a50271a007bf543a2d9e3defe7a7c9
diff --git a/y2014_bot3/BUILD b/y2014_bot3/BUILD
index 1118d09..25a6445 100644
--- a/y2014_bot3/BUILD
+++ b/y2014_bot3/BUILD
@@ -54,6 +54,7 @@
         "//frc971/control_loops/drivetrain:drivetrain_queue",
         "//frc971/wpilib:buffered_pcm",
         "//frc971/wpilib:dma",
+        "//frc971/wpilib:drivetrain_writer",
         "//frc971/wpilib:gyro_sender",
         "//frc971/wpilib:joystick_sender",
         "//frc971/wpilib:logging_queue",