Added two new error codes and a new callback for when the underlying Push Service goes down and the connection needs to be re-established.

The two new error codes are: PUSH_SERVICE_CONNECTION_CLOSED and PUSH_SERVICE_CONNECTION_PERMISSION_ERROR.
As well as two additional constants: CREATE_OPERATION and LAUNCH_APP_ON_PUSH_OPERATION.

The new callback is pushServiceConnectionReadyCallback provided in the static create call.

** Existing WebWorks applications will not be impacted by these changes. **