Fix #20: Deal with Transformable objects with no transformer class
Fix #20: Deal with Transformable objects with no transformer class

Transformable objects should use NSKeyedArchiver it a transformer
class is not defined

Signed-off-by: Jimi Xenidis <76b363d276dba42912c2eb4a024728f40d1d8033@pobox.com>

jimix/CDTDatastore,jimix/CDTDatastore,jimix/CDTDatastore