* Remove non-functional parse features.
* Fabfile changes
* Switch flag to use_sbd, controlling whether to use the b transition, or just dynamic head-parsing.
* Remove unnecessary orth/paren/quote features.
* Remove pause and history features.
* Remove unused sbd feature class
* Remove unused feature groups in parse_features
* Shunt greedy parser and tagger into their own files, to make refactoring easier.
* Removed unused features from tagger.
* Removed quote and parentheses features from tagger.
* Remove quote and parenthesis count features from sentence.
* Remove pause duration features
* Remove use of greedy parser from train