Wait until QUnit is loaded, before checking for it in inject.js.

First, I do not expect this to be pulled in, since it is a wrong way to do this anyway. Initial idea was to run this code only if QUnit framework is detected below, but for some reason:

```javascript
YUI({
        delayUntil: "domready"
    }).use("tempest", function bootInjectedDriver(Y) {
    ...
```
runs _after_ `window.onload` (huh) and then it is obviously too late to stop QUnit from auto-starting.

Quick and dirty way to fix: #44.