SFV-1383

Added a function to override XMLHttpRequest.js  provided by OpenLayers.

OpenLayers originally overrides this file that is provided by https://github.com/ilinsky/xmlhttprequest

Based on http://forums.asp.net/t/1910658.aspx/1?SCRIPT438+Object+doesn+t+support+property+or+method+transformNode+in+IE10

there is a single line that needs to be added for IE.