Version 0.2
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* Added more co-morbidity mappings, Elixhauser original and Quan/Elixhauser.
* Exposed more functions to public API
* Better conversion of ICD-9 codes to textual representation
* Expanded vignette
* Bug fixes and test cases
* Improved documentation

Version 0.1.1
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* Include missing import for memoise
* optionally process AHRQ comorbidity subcategories into parent categories
* include the processed binary data. Unlikely to change often, and not too big.


Version 0.1
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* First release. Fully functional, no known bugs, but will benefit from addition of planned features described in README.

