Update OAuth/ResourceOwner/GenericOAuth1ResourceOwner.php

Fix #186 & #187
Merge pull request #188 from stloyd/patch-1

Update OAuth/ResourceOwner/GenericOAuth1ResourceOwner.php
Update OAuth/ResourceOwner/GenericOAuth1ResourceOwner.php

Fix #186 & #187

Added support for Yahoo OAuth 1.0
Rebase & add tests to Yahoo resource owner