Fix for the hapticFeedback

Now it only perform a haptickFeedback when entering the trim zone, instead of when goin in or out of the zone.
Fix bug that could leak memmory.

The velocityTraker must be recycled after use. This is valid for both ACTION_UP and ACTION_POINTER_UP.
Merge pull request #208 from arthurbenemann/JoystickFix

Fix Haptick feedback, and a small bug that could leak memory in the Joystick.