Bumping to 3.2.1 with updated cert bundle.

Extract the `code` from the `signed_request` for JS SDK pairing

Adding support for the JS cookie and its use in the PHP SDK

Upgraded to version 3.0.1.

Unit tests can be run from the command line using:

  phpunit --colors --coverage-html coverage --verbose --stderr --bootstrap tests/bootstrap.php tests/tests.php

Changes:
+ Added a new bootstrap file (as bootstrap.php) that helps the unit tests run more smoothly.
+ Allow for the possibility that session_start has already been called prior to construction of a Facebook class.
+ Updated the app-secret unit test to confirm that Desktop applications require a user access token to get insights.
+ Make sure that current URLs like /example.php?a=b&c=&d retain their structure (don't strip or introduce an equals
  sign for valueless GET params), and added unit tests to exercise this.
+ CSRF state is now managed using the persistent store instead of cookies.

Updated to use access tokens instead of sessions internally.

This implies many changes to the storage scheme, which is
why it is a major revision.

Upgrading from a previous version should change most
getSession() calls to getUser() which returns
a User's ID instead of a session object.

See: https://developers.facebook.com/blog/post/503

Supported the new OAuth2 error format

Release v2.1.1

php-sdk changes to support signed_request

Release v2.0.7