Limit Twitter requests

[allilevine]

Multiple methods in the Twitter class make the same request:

keyring/includes/services/extended/twitter.php

Line 63 in 4619936

$response = $this->request( $this->verify_url, array( 'method' => $this->verify_method ) );

keyring/includes/services/extended/twitter.php

Line 83 in 4619936

$res = $this->request( $this->verify_url, array( 'method' => $this->verify_method ) );

keyring/includes/services/extended/twitter.php

Line 101 in 8f7df14

$res = $this->request( $this->verify_url, array( 'method' => $this->verify_method ) );

It would be great if we could cache the response to avoid making the same API call multiple times.