fixed PLAY-497

Using the same .jpg image crushes Player
I plan to remove these `onComplete`/`onError` stuff because it also complicates things (and several audio bugs are caused with conflicts in order of calling this functions and `.check()`) and to require the `loader` function itself to call `ResMan.trigger(url, object)` or `ResMan.error(url, error)` in corresponding cases. If the resource is in cache, it will receive it as an argument to a `loader`, [See this commit](https://github.com/Animatron/player/commit/07591ddd438fb7440ecaa7d8c7bc371362d5210e) (not merged).