code: function(x1, y1, x2, y2, diagonalMovement){
              if(!diagonalMovement){
                  return Math.abs(x2 - x1) + Math.abs(y2 - y1);
              } else {
                  return Math.max(Math.abs(x2 - x1), Math.abs(y2 - y1));
              }
          }
docs: Gets the distance in tile moves from point 1 to point 2.
  @method getTileMoveDistance
  @param {Number} x1
  @param {Number} y1
  @param {Number} x2
  @param {Number} y2
  @param {Bool} [diagonalMovement=false]if true, calculate the distance taking into account diagonal movement.
  @return {Number}