* Get a session’s error handler
* Change the signature of all methods to add the callee
* Deserialize rpc callbacks
* Expose the session error handle on its config property
* When a token refresh error occurs and there is a session error handler
propagate the error to the handler
* Add Session class and expose it to JS
* Add error property on the sync config object for the event handler
* tests
* refactor access token refresh
* chrome debugging
Radu Tutueanu
Yavor Georgiev