Server: Append injected scripts to body instead of head

Any setup that loads QUnit in the body instead of head will timeout out otherwise.

I ran into this while [integrating browserstack-runner with Globalize](https://github.com/jquery/globalize/issues/235). The unit testsuite there has a different setup which currently causes a timeout, even though the tests pass just fine.

I briefly looked at the `tests` folder to see if I can add or modify something there. Some pointers would be useful there. Feel free to include the Globalize test suite there, that would be a good testcase for QUnit+requirejs.