That took a while... but I think it makes sense...

Tried to make it as straight foward as possible. Kept the extrac base url thingie :)
Thinking of moving BinaryLoader to examples/js/loaders.... what do you think @alteredq?

Using xhr.addEventListener instead of xhr.onreadystatechange. Changed 'complete' event to 'load' as native JavaScript.

The only confusing part of this approach is the event object that gets dispatched. For ImageLoader you need to look for event.image, and for OBJLoader you need to look for event.object. Maybe it should be consistent for all and just be event.content?

Hesitant on whether this should extend Loader or not. I guess we'll see whether is needed or not once we have more features.

Tinkering with the problem of images loading async...
Maybe this should be TextureLoader instead...

I tried to move BinaryLoader to /examples/js but SceneLoader needs it.
Curious to hear what people thinks about this change.