* Fabfile changes.
* Add files for Vocab class manager
* Compile vocab.pyx
* Switching to using the class in vocab.pyx, to clean up index.hashes
* Tmp commit of lattice refactoring
* Massive refactor now compiles. Moving to unit tests.
* Add basic sentence tests
* Some basic sentence tests passing after refactor
* Tmp commit on lattice refactoring. Parsing completes with 61pc acc on 1k training. Problem with OOV words.
* Bug fix to vocab for loading rare words
* Rename vocab to lexicon
* Finish renaming vocab to lexicon
* Remove masking thing from features
* Tmp. commit. Labels broken.
* Tmp commit. Massive refactor continues.
* Tmp commit. Refactor continues, parser now runs, 49pc acc with 1k training
* Tmp. commit. Matching old version in early debugging.
* Tmp commit. Accuracy bugs fixed. Tightening up.
* Reinstate priority queue for beam
* Remove print statement