Replace removeExpression() and setExpression() use - fixes IE8,IE9,IE10 bugs#58

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robmckinnon wants to merge 1 commit intoericmmartin:masterfrom robmckinnon:master

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Commits on Sep 5, 2014

replace use of removeExpression() and setExpression() as these functions are not supported in IE8, IE9, IE10
Rob McKinnon
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