Boltzmann 0.1.2, NaiveBayes 0.1.0

1. Boltzmann packages went 0.1.2
2. New package - NaiveBayes - was added. 

Currently there are several implementations of naive Bayes classifier in Julia (e.g. [1], [2]). However, to my knowledge non of them is maintaineed or is installable via package manager. Thus I propose my own extensible implementation. 

[1]: https://github.com/nutsiepully/NaiveBayes.jl
[2]: https://github.com/johnmyleswhite/NaiveBayes.jl