example snippet to change fb sdk init on firefox.

supports page path for liked and not-liked pages. a.k.a fan gate

by Dave Cohen: support markup for both connected and non-connected users on same page.  Avoids need for page refresh and works with Drupal page cache.

Clean up sanity check.  No more false positives during race condition.

cleanup JS init code

Changed default to false.

refs #1166272 by funkym, Dave Cohen: correctly check the map_account setting, which is checkboxes (not radios like it once was).

fixes #1273828 by Dave Cohen, tpainton, Jolidog: facebook gets all weird when classname is fb-login-button.

Include extended perms when requiring authorization.