Fixed Windows Live ID OAuth Provider

- Changed all 'windowslive' in 'windowslive'
- Changed 'access_token' field to 760 chars to hold the access_token
from Live ID
- Changed some typo's
Update migrations/2012_05_26_151608_create_clients.php

Changed access token field type to Text and removed it's index.
Merge pull request #36 from Stayallive/master

Fix for Windows Live ID Service Provider