Ensure setAttribute does not cause stack overflow #163
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Line 394: the use of setAttribute without first checking to see if the attribute already has the value desired can cause infinite recursion and stack overflow if cell.js is used with over libraries that either re-define setAttribute or elevate attributes to DOM node properties with getters and setters. Guarding the call to setAttribute with getAttribute eliminates this type of problem. The issue was uncovered when working with the onsen ui framework.