element.scrollIntoViewIfNeeded Polyfill for everyone

This gist provides a simple JavaScript implementation of the non-standard WebKit method ``scrollIntoViewIfNeeded` that can be called on DOM elements.

Install
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`npm install element.scrollintoviewifneeded-polyfill`

Usage
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Just use the code in `index.js` in your app or website. You can see usage in the test page `test.html`.

The parent element will only scroll if the element being called is out of the view. The boolean can force the element to be centered in the scrolling area.

Improvements
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* This code doesn't handle well cases where the element has `position:absolute`` (and maybe other CSS modifications).
* This code doesn't handle cases where the scroll area isn't the direct parent of the target element.

Kudos to the Gist of Hubert SABLONNIÈRE @hsablonniere
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If you have any ideas to improve this code or if you think the WebKit implementation doesn't work like this, feel free to start a discussion...

[https://gist.github.com/hsablonniere/2581101]