/*!
 * Shim for MutationObserver interface
 * Author: Graeme Yeates (github.com/megawac)
 * Repository: https://github.com/megawac/MutationObserver.js
 * License: WTFPL V2, 2004 (wtfpl.net).
 * Though credit and staring the repo will make me feel pretty, you can modify and redistribute as you please.
 * Attempts to follow spec (https://www.w3.org/TR/dom/#mutation-observers) as closely as possible for native javascript
 * See https://github.com/WebKit/webkit/blob/master/Source/WebCore/dom/MutationObserver.cpp for current webkit source c++ implementation
 */