Flop and Roll added

-Fixed height sensors
-Added secondary (plane+box) ground for height sensors
-Added flop and roll  method to applyActions

-Still missing learning for flop and roll.
Fixed the reset seg fault problem

On teardown, cleared the vector of objects that should be destroyed
with the reset
Connected superball to learning

SuperballApp now uses learning to optimize 24*2=48 parameters of flop
and roll.
Merge pull request #79 from NASA-Tensegrity-Robotics-Toolkit/learningSuperball

Learning parameters of Flop and Roll for superball locomotion.