commonMethod() now has same return as a standard request()

This allows access to the contents of request's `res` value, which contains essential information like the HTTP statusCode.
Merge pull request #1 from tapvt/master

`commonMethod()` now returns in same form as `request()`
WARNING: This will break existing code, but it seems better to do it now rather than later.  As far as I know, we have no other users.