Authorization fix for OAuth1

The commit c6e2d74eca2b8bc6f9d9aea183655886e49b5216  breaks the authorization in cases when `$bodyParams` is not empty. In such cases `$parameters` will get `oauth_verifier` key from `$bodyParams` (which is necessary only to make a signature) and puts it into the final authorization header, so authorization fails because of the wrong signature (example, try FitBit authorization).

These changes made better naming and fixed the authorization headers in such cases.