by aangel, Dave Cohen: add parameter to event callback.  Otherwise, post-remove events have no way to know which application is removed.

Cleaned up some database columns that are no longer used.  And they were causing problems for databases in strict mode.

Initial changes to use new session model (no "adding" of apps).
Still more work to be done version 2.x.

Now, you can create a role manually.  Users who add the app will be given the role automatically.

Re-arranged a number of things to make it possible to connect to facebook API from non-canvas pages.  Added fb_actions, where actions will live that invoke facebook APIs.