Alternate definition of mean, variance for Categorical distribution.
Corrected logpdf for MultivariateNormal
Go back to normal cdf from RMath. It is much more precise.
For logpdf for multivariate normal
faster implementation of logpdf for MultivariateNormal
Dirichlet speedup
Merge pull request #21 from JuliaStats/anj/normcdf

Go back to normal cdf from RMath. It is much more precise.
Merge pull request #22 from JuliaStats/anj/dirichlet

Dirichlet speedup
logpdf implemented for Dirichlet distribution
Switch basic univariate types to immutable's

Replace expr() with Expr()
Replace randi() with rand(1:n)
Merge pull request #28 from JuliaStats/immutable

Switch basic univariate types to immutable's
Finish transition to immutables
Algorithm AS 176
Fix scaling bug
adding inverse gamma distribution
adding inverse gamma distribution
Merge branch 'inversegamma' of https://github.com/danmerl/Distributions.jl into inversegamma

Conflicts:
	src/Distributions.jl
fixing dumb bugs, adding cdf for inverted gamma rvs
adding modes function and adding more efficient rand! for invertedgamma
Adding quantile function and reparametrizing so things are consistent between the gamma and inverse gamma implementations.