Redirects now return code 302

[jasonpenny]

The code is expecting redirects to send code 301, but they now send 302

Fixes #87

Testing

<?php
require_once 'vendor/autoload.php';

$client = new Tumblr\API\Client(
    '...key...',
    '...secret...'
);
$avatar = $client->getBlogAvatar('david', 96);

var_dump($avatar);