Add email address

By using the right scope we have access to emails:

    'scope' => 'r_basicprofile r_emailaddress',
    'profile_fields' => array('id', 'first-name', 'last-name', 'formatted-name', 'headline', 'picture-url', 'summary', 'location', 'public-profile-url', 'site-standard-profile-request', 'email-address')