small fix for usernames with underscores

On line 16 of the twitter.class.php you have:

$this->auth = base64_encode($user . ':' . $pass);

Replace it with:

$this->auth = strtr(base64_encode($user . ':' . $pass) , '+/=' , '-_,');

Now twitter accounts with an "_" in the unsername will work!

Yea!

^^^ Actually that wont work.

Replace Original:
$this->auth = base64_encode($user . ':' . $pass);

With this:

$this->auth = base64_encode(strtr($user , '+/=' , '-_,') . ':' . $pass);