Textarea autosizer modified from Shog9's answer on SO: http://stackoverflow.com/a/7875/900747

autosize.js

var autosize = function(e) {
	var area = e.currentTarget,
		ch = area.clientHeight, // These should be cached as much as possible since this is triggered on keyup
		sh = area.scrollHeight;

	if (ch == sh) {
		area.style.height = "30px";

		// Recache them
		var ch = area.clientHeight,
			sh = area.scrollHeight;
	}

	var adjustedHeight = Math.max(sh, ch);

	if (adjustedHeight > ch) {
		area.style.height = adjustedHeight + "px";
	}
};

This removes support for a maxHeight parameter, changes element retrieval so it's easier to use with Backbone and adds better caching.

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