Merge pull request #123 from simonbyrne/master

Inverse Gaussian distribution
ccdf, logcdf for inverse Gaussian
add vectorized evaluation section in sphinx doc
add common interface section for multivariate distribution in sphinx doc
add sphinx doc for matrix distributions
add sphinx documents from sample and wsample
Merge branch 'master' of git://github.com/JuliaStats/Distributions.jl
add sphinx document for fitting
Migrate documents to sphinx doc.
fix type declarations
add log1mexp and log1pexp functions
added import Base.Ranom to Distributions.jl
Merge pull request #129 from eriktaubeneck/master

added import Base.Ranom to Distributions.jl
kolmogorov rand