function Constraint(){

	    // parent world of the constraint.
	    this.parent = null;

	    // first body of the constraint.
	    this.body1 = null;

	    // second body of the constraint.
	    this.body2 = null;

	    // Internal
	    this.addedToIsland = false;
	    
	}
The base class of all type of the constraints.

@author saharan
@author lo-th