Part-way through new-style Phrase and Mention relationships.
Intermediate stage of improving Phrase/Mention/Coref.  Compiling but not working; renaming yet to do.
Further intermediate stage of improving Phrase/Mention/Coref.  Compiling but not working; renaming yet to do.
Further, further intermediate stage of improving Phrase/Mention/Coref.  Compiling but not working; renaming yet to do.
Further, further, further intermediate stage of improving Phrase/Mention/Coref.  Compiling but not working; renaming yet to do.
Additional Phrase/Mention/Coref work.  ForwardCoref removed.  Stand-in DeterministicProperNounCoref.  Coref evaluation now in util.ClusterEvaluation.  CorefMention removed; use Mention.attr[MentionCharacteristics] instead.
Add NLP command-line for calling DeterministicNamedCoref.  Change TokenSpan.string to concatenate space-separated token strings, so as to avoid potential newlines and HTML in the document string.
Serialization and basic concrete implementation for EvaluatableClustering.
Fix deprecated Phrase.phrase.  Deprecate coref.ParseBasedMentionFinding until it is moved.
Merge.
Remove bad import.