Alternate definition of mean, variance for Categorical distribution.
logpdf implemented for Dirichlet distribution
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.
Merge pull request #30 from danmerl/inversegamma

Adding InvertedGamma random variables
Merge pull request #25 from sbos/master

logpdf implemented for Dirichlet distribution
initial stubs for wishart and inverse wishart samplers
Working Wishart and Inverse Wishart random matrix generators
Merge branch 'wisharts' of https://github.com/danmerl/Distributions.jl into wisharts

Conflicts:
	src/Distributions.jl
adding pdf methods for wishart and inverse wisharts
Full tested the pdfs against R, better error checking
Fix isupport() to be insupport()
Merge remote-tracking branch 'origin/master' into wisharts
Update multivariate normal to the changes in CholeskyDense
Fix of mulitvariate normal to extract the upper cholesky factor.
fixes for updated cholfact