Supported the new OAuth2 error format 

Release v2.1.1 

php-sdk changes to support signed_request 

Release v2.0.7 

bump version to 2.0.6 

bump version to 2.0.4 

Tagged release 2.0.3 

Tagged release 2.0.2 

Tagged release 2.0.1 

Tagged release 2.0.0