Feat: Get related items of a given item order by support

[artsnr1]

Currently it gives me all possible itemsets.
What I want is a function that accepts an item and returns all its pairs (excluding itself) sorted in order of support
getRelatedItems(item, maxItems?)

var transactions = [
[1, 3, 4],
[2, 3, 5],
[1, 2, 3, 5],
[2, 5],
[1, 2, 3, 5]
];
getRelatedItems(1) // Output: [3, 5, 2]
getRelatedItems(2) // Output: [5, 3, 1]
getRelatedItems(3) // Output: [5, 2, 1]
getRelatedItems(4) // Output: []
getRelatedItems(5) // Output: [2, 3, 1]