LabeledCategoricalVariable: Don't bother with "self".
ConllCorefLoader: Fixed capitalization typo in method argument.
MorphologicalAnalyzer1: Remove TODO that is no longer relevant.
WithinDocCoref1:  Improvements to namGender method.  It was previously
quite broken.
MentionGender, MentionNumber: New DocumentProcessors that add attributes
to the Mentions in the MentionList.
MentionTypeLabeler: New DocumentAnnotator classifies Mention into
Ontonotes NER labels.
DocumentAnnotator: New methods mentionAnnotationString and
documentAnnotationString.
NLP: Use mentionAnnotationString.