Inject sinon sandbox in the current module before the QUnit module's setup()` method is invoked.

This allows the developer to initiate their stubs, mocks and spies in the setup method, safe in the knowledge that they will be automatically reset between each test.

I had trouble getting the jsTestDriver unit tests to work (and wasn't 100% sure what coverage I should be adding!)
This is going to cause unexpected behavior, because Sinon will not work as advertised...