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/**
 * Returns a function, that, as long as it continues to be invoked, will not
 *  be triggered. The function will be called after it stops being called for
 *  N milliseconds. If `immediate` is passed, trigger the function on the
 *  leading edge, instead of the trailing.
 */
function debounce(func, wait, immediate) {
	var timeout;
	return function() {
		var context = this, args = arguments;
		var later = function() {
			timeout = null;
			if (!immediate) func.apply(context, args);
		};
		var callNow = immediate && !timeout;
		clearTimeout(timeout);
		timeout = setTimeout(later, wait);
		if (callNow) func.apply(context, args);
	};
};