* OAuth storage handler interface
* @author Ben Tadiar <ben@handcraftedbyben.co.uk>
* @link https://github.com/benthedesigner/dropbox
interface Dropbox_StorageInterface
* @param string $type Token type to retrieve
public function get($type);
* @param \stdClass $token Token object to set
* @param string $type Token type
public function set($token, $type);
* Delete tokens for the current session/user
public function delete();