Mod to make sinon.useFakeTimers() compatible with Ember.js runloop

sinon-useFakeTimers-to-avoid-touching-window-Date.js

if (!sinon._originalUseFakeTimers) {
    sinon._originalUseFakeTimers = sinon.useFakeTimers;
    sinon.useFakeTimers = function() {
        // make sure we don't override window.Date used in
        // Backburner.setTimeout() to optimize window.setTimeout() call numbers
        return sinon._originalUseFakeTimers.apply(this, [new Date().getTime(), "setTimeout", "setInterval", "clearTimeout", "clearInterval"]);
    };

    sinon._originalTest = sinon.test;
    sinon.test = function(callback) {
        return sinon._originalTest.call(this, function() {
            callback.apply(this, arguments);

            // wait for further runloops to finish (2s is the mocha timeout)
            this.clock.tick(2000);
        });
    };
}