Allow progress bar to live inside of any element

[jonjaques]

This is useful in my case, where I have an admin panel-looking app, and I want to scope the loading animation to a specific pane.

I'm going to be honest, was lazy and did this PR on GitHub so I didn't run the tests.

However, I have a demo running here: http://jsbin.com/odOf/3

Fully willing to rebase this and resubmit, just let me know what you think. Thanks for this BTW.

[styfle]

I second this request. This would be a great substitute to the typical "indeterminant spinner" every time something is clicked.

Now the next step would be multiple NProgress instances for different elements that are loading 👍

[lipis]

multiple nprogress instances I think it's too much for this component.. but putting in on a specific div is pretty good idea..!

[lipis]

on a second thought and after playing with it a bit more.. I think this kind of progress bar should be only one on the page ;) so maybe it's an overhead to make the whole thing configurable and stuff... let's keep it simple..
Plus is so simple that is not that hard to actually implement it the way you want..

[cryptiklemur]

This would be awesome to have

[silvermanners]

I was a bit let down that I can't position it in any div wrapper I want. This would be THE feature to have.

[frankie-loves-jesus]

👍

[rstacruz]

Done, thanks Jon!

See #86.