Plopter wip

Hey, 
All of the things I modified should be restricted to the /Tools/autotest directory. Except for the 
"
// TODO(BrandonJ): Uncomment this on next commit
// stabilize_plane();
" 
lines. 

To run the sim as it stands, got to /Tools/autotest and run 
"./sim_vehicle.sh -w -v ArduCopter -f Rascucopter --console --map"

why do you multiply by 0.1 and subtract by 1080? What units are these?