Allow positioning relative to parent container

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I found myself a little surprised that setting the parent container didn't actually make the notification appear relative to that container. We needed the notifications to appear closer to the user's point of focus (a particular form or element on the page) and I figured it might be useful addition to the project. Usage:

notify.config({ parentalPosition: true, container: $('#order-detail') });

left / center / right work as expected.

[threewordphrase]

Bump... Looking forward to using a non-forked version in my next project :)