build/craftymatter.js
function( pointA, pointB ) {

	        return { x: pointB.x - pointA.x, y: -( pointB.y - pointA.y ) };
	    }
function( pointA, pointB ) {

	        return { x: pointB.x - pointA.x, y: -( pointB.y - pointA.y ) };
	    }
function ( pointA , pointB ) { return { x : pointB . x - pointA . x , y : - ( pointB . y - pointA . y ) } ; }
Creates a vector given its origin and destiny points
@param  {Vector} pointA - vector origin
@param  {Vector} pointB - vector point
@return {Vector}        Resulting vector
Creates a vector given its origin and destiny points