* Removing happax stuff. Added length
* Removed happax. Not sure if good idea.
* Add length property
* Restore happax. commit uncommited work
* Switch to 32bit hash for strings
* Add hash tests
* Update gitignore
* Remove happax stuff
* Shifting to WordTree instead of dense_hash_map for storage.
* Add murmurhash to setup while we figure out cython includes
* Add string decode and encode helpers to string_tools
* Refactoring tokenizer
* Restore unicode, work on improving string storage.
* Restore string saving to spacy
* Remove dependence on murmurhash
* Progress to getting WordTree working. Tests pass, but so far it's slower.
* WordTree in use. Need to reform the way chunks are handled. Should be properly one Lexeme per word, with split points being the things that are cached.
* Refactor spacy so that chunks return arrays of lexemes, so that there is properly one lexeme per word.
* Working version, adding improvements
* Working version that uses arrays for chunks, which should be more memory efficient