Quadrotor

Revision 08b4f0df

Changed max thrust in nav_lib and set thrust to 0 in mk_wrapper

Tested joystick_control with the quadrotor, and it works! And it now has
enough thrust to get it off the ground.

    control_dead.pitch = 0;

    control_dead.roll = 0;

    control_dead.yaw = 0;

    control_dead.thrust = 60;

    control_dead.thrust = 0;

    ros::Rate loop_rate(20);

    while (ros::ok())

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