Bug 971559 - [System2] Instantiable Storage r=alive

https://bugzilla.mozilla.org/show_bug.cgi?id=971559

Screenshot of JSDoc:

![screen shot 2014-02-12 at 6 07 58 pm](https://f.cloud.github.com/assets/122602/2156106/b6539200-9453-11e3-8227-e5b79030be7a.png)