sutoiku/formula.js — pull request #26 by joaojeronimo (2014-08-06 18:05:43+00:00)
Title: Refactor

* Separate formulas in their respective [categories](http://office.microsoft.com/en-001/excel-help/excel-functions-by-category-HA102752955.aspx)
* Fix several bugs
* Cover 100% of the code with tests