Overwrite sync expect fn with expectAsync

[christian-bromann]

In Jasmine our async matchers aren't working because the expected promise is never resolved and results in errors like these:

Error: Expected [object Promise] to be existing.
    at <Jasmine>
    at ...

Therefor let's just overwrite the async expect function with this one. The only downside is that the following matchers aren't available anymore: toBeNegativeInfinity, toBePositiveInfinity, toHaveBeenCalledBefore, toThrowMatching, withContext, toHaveSize, toHaveClass. Given they aren't really useful in the e2e context I believe this is the best way to resolve the overall confusion.

[christian-bromann]

I will go ahead and merge.