statsample now working with rb-gsl and gsl-nmatrix

[Sameer Deshmukh]

Hello,

Last week I made some changes to statsample which let it work with absolutely no problems without gsl, with rb-gsl or with gsl-nmatrix.

I have summarized the work in this blog post: http://v0dro.github.io/blog/2015/05/12/making-statsample-work-with-rb-gsl-and-gsl-nmatrix/ and also put in usage instructions.

Hope you'll find it useful :)