Reworking syntax on the SerializerTest so that it uses the same serialization/deserialization techniques of the custom serializer.
Fixing syntax on SerializerTest so that it grabs the object attributes in the same manner they are composed when PaperTrail serializes them in the :record_update and :record_destroy callbacks.
Update CHANGELOG text to be more accurate for pull 180.
Adjusting the methods that dealt with the encoding/decoding data for attributes in ActiveRecord's :serialized_attributes hash so that it will fall back on YAML as the default serializer.  Close #197