* Add emoticons to tokenization
* Add is_urlish function
* Implement is_number
* Add tests for is_number
* Add LIKE_URL and LIKE_NUMBER flag features
* Use LIKE_URL and LIKE_NUMBER flag features. Seems to improve accuracy on onto web
* Fix strings i/o, removing use of ujson library in favour of plain text file. Allows better control of codecs.
* Add mappings to Twitter POS tag corpus
* Add tests for like_number
* Add tests for like_url
* Add tests for emoticon tokenization
* Add pos_tag method to Language
* Whitespace
* Add test for '' in punct
* Add '' double quote to suffixes file
* Work on intro copy
* Remove vocab10k field, and add flags for gazetteers
* Fiddle with POS tag features
* Remove non_sparse method --- features wanting this can do it easily enough.
* Add Co. abbreviation to tokenization rules