Priority Queue

This is a very simple to use javascript implementation of a priority queue. Use as follows,

``javascript
var queue = require('priorityjs');

var pq = new queue.PriorityQ(function(x, y){ return x < y; });
pq.push(4);
pq.push(2);
pq.push(8);

pq.peek(); // peek 2, 4, 8 etc.

pq.pop(); // pop (remove) 2, 4, 8 etc.

pq.clear(); // reset
...
``