Animations triggered before a renderable is added to the scene graph do not behave as expected

[despeset]

var s = new Square({ x: 10, y: 20 });
s.animate({ x: 50, y: 100 }, 10000);
engine.push(s);

In this case, the engine will pause because the created animation doesn't register properly with the engine when initialized. If the last two lines are reversed it works as expected:

engine.push(s);
s.animate({ x: 50, y: 100 }, 10000);

The library should probably throw a warning if you try to animate a renderable like this as it is not intuitive.