implement ordered sampling
Merge pull request #167 from one-more-minute/ordered-sample

Ordered sampling
Update univariate.rst

Updated docs with Inverse Gaussian distribution
Update univariate.rst
Merge pull request #169 from AntonioSaragga/master

Updated docs with Inverse Gaussian distribution
allow zero trials in Binomial distribution
remove kde.jl (migrated to Stats.jl)
relax the test criteria for Dirichlet mle
Merge branch 'master' into wsample