Add a test to make sure runAsTask works in production

[phillipskevin]

The current test for runAsTask (

can-queues/can-queues-test.js

Lines 458 to 484 in b16c3d4

	QUnit.test(".runAsTask(fn)", function(){
	var lastTask;
	var outerNotify, innerNotify;
	var obj = {};
	var thing = function(){
	queues.enqueueByQueue({
	"notify": [innerNotify = function notify () {
	lastTask = queues.lastTask();
	}],
	"domUI": [function domUI () {
	var stack = queues.stack(lastTask);
	QUnit.equal(stack[0].fn, outerNotify);
	QUnit.equal(stack[1].fn, thing);
	QUnit.deepEqual(stack[1].args[0], 1);
	QUnit.equal(stack[1].context, obj);
	QUnit.equal(stack[2].fn, innerNotify);
	}]
	});
	};
	var thingQueued = queues.runAsTask(thing);
	queues.enqueueByQueue({
	"notify": [outerNotify = function notify () {
	thingQueued.call(obj, 1);
	}]
	});
	});

) is using lastTask so cannot be run in production. We should add another test to make sure runAsTask works in production.