Feature request: clear() function

[KarstenHoehne]

Implement a function clear() that will reset the request count to 0

Use Case: Imagine there is a long running request + the user leaves the page. The loading bar indicator will still be displayed, even though the user doesn't care about the request result anymore. The loading bar will not finish because the long running request was still counted under totalReqCount + there is no way to reset the status