* Development 15 | Beta 0 | Development 2 | Experimental 4 *

* NOTE: Started writing Javadoc's

* UPDATED PHYSICS ENGINE to Physics Engine 1 Build 2:
* Added the method checkColiision() in CollisionDetector
* Added the method applyGravity() in Gravity2D
* Added variables in PhysicsObject2D to disable gravity, collisions and
movement for that object