[wip #304] debugging failing test on travis

@boennemann @svnlto I was able to get the failing test locally with `rm -rf node_modules && npm install`.
I guess this has todo with a new version of karma / browserify? Somehow the `this.requestDefers` in the
beforeEach hook is not the same as the `this.requestDefers` in the this.fakeRequest definition. I am
puzzled, someone of you have an idea?!

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