Priority queue getParentOf

[geekrelief]

The code sample below doesn't return the optimal path.

    var star = new EasyStar.js();
    star.setAcceptableTiles([0]);
    star.enableDiagonals();
    star.setGrid([
        [0, 0, 0],
        [0, 0, 0],
        [0, 0, 0]
    ]);

    star.findPath(0, 1, 2, 1, function(_path){
        console.log(_path);
    });

    star.calculate();

It looks like the PriorityQueue is getParentOf calc should be:

Math.floor((index-1)/2);