Phpdocs cleanup

Fixed some of the methods @param PHPDocs (did not match the method signature). Also added some new lines for readability. @seejohnrun, feel free to only incorporate the actual fixes if you think the extra new lines are not helping ;)

It is related to pull request #1 from Igor but you should not be requiring (especially without require_once) vendor/autoload.php as this is supposed to be handled outside of the Tumblr API classes.