Excluding Datepicker Moment.js tests from IE9 and less

I needed to do this because versions of IE9 or less don't handle globals correctly when loading modules via require for tests. It will randomly overwrite variables at the wrong time because it is running multiple tests at once. It will even disregard the setup and teardown functions. This is very inconsistent, and this seemed to be the only way to get it to work. 

The functions still work in IE8 and IE9, but with how they deal with QUnit and RequireJS, it is not possible to test them there.

@kevinparkerson and @adamalex could you take a look and make sure this doesn't violate anything we're doing, or if you have a better idea?