moved all code related to normalizeAnnotations module to a new class AnnotationNormalizer
added some comments
move code of PhraseClauseAnnotation module to a new class named PhraseClauseAnnotator
moved code of PhraseClauseAnnotation module to class PhraseClauseAnnotator
renamed Initiation module to Initializer
moved all code related to DittoAnnotation module to a new class called DittoAnnotator
added dittoAnnotator module into Learner class
moved all code related to PronounCharactersAnnotation module to a new class named PronounCharactersAnnotator
added PronounCharactersAnnotator module to Learner
added comments
Renamed UnknownWordBootstrapping class to UnknownWordBootstrappingLearner
refactor and comments