Made a lot of changes this go round. First, deleted our compressor class
because there was already one in the FRC api that will manage things
automatically. Then, I commented out everything in Robotmain that hasn't
yet been tested. Removed all calls to gyro.free(), which was the source of
our problem. I also deleted the instances of relays for pistons because
the solenoids can be run straight from the solenoid breakout, which will
save us from mounting a few more components. I also added code that should
actually control the pistons. I added a Math.abs() to
XboxController.getRightBumper() so that it will return a positive value,
just to make it simpler. I think that's it, but there may be more that I'm
forgetting.