Allow optional custom container while maintaining the previous performance improvements #15
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Tested as working here (latest Chrome): http://jsfiddle.net/rDm2M/39/
Minified version here: http://jsfiddle.net/rDm2M/40/
See output in the browser console.
I tested with/without getBoundingClientRect, with/without container. Tried to be careful about performance, but didn't actually test that.