Reliable cross-domain template loading with MSIE >= v7 using XDomainRequest

I updated the getXhr and fetchText functions to check for the domain you are on vs. the domain you are trying to load a template from.  It also checks to see if the browser is MSIE >= v7.

If you are on a different domain and using MSIE >= 7 browser, it will create, configure, and use XDomainRequest instead of XMLHttpRequest to load the template.  This works reliably in all aforementioned versions of MSIE.

Caveat: This will rely on the web server being configured with the proper Access-Control-Allow-Origin headers either through server configuration or script manipulation.