v0.0.3 - 2013/10/13:    Comparable.threshold is now an attribute (instead of property)
                        Fixed package-level imports

v0.0.2 - 2013/10/04:    Replaced Comparable.equality_list/similarity_dict with attributes
                        Replaced Comparable.similarity_threshold with threshold

v0.0.1 - 2013/10/02:    Initial release of Comparable.
