Print slow qunit tests

slow-qunit.js

var tests = [];
var startTime;
QUnit.testStart(function() {
  startTime = +new Date;
});

QUnit.testDone(function(obj) {
  tests.push({
    name: obj.name,
    time: +new Date - startTime
  });
});

QUnit.done(function() {
  tests.sort(function(a, b) {
    return b.time - a.time;
  });
  tests.forEach(function(test) {
    console.log(test.name, test.time);
  });
});