Fix isCrossOriginUrl in IE

NOTE: This pull request depends on #721.  Merge that first.  Test by running the newly created specs for isCrossOriginUrl:

[http://localhost:8080/Specs/SpecRunner.html?spec=Core%2FisCrossOriginUrl](http://localhost:8080/Specs/SpecRunner.html?spec=Core%2FisCrossOriginUrl)