Alternate definition of mean, variance for Categorical distribution.
Algorithm AS 176
Fix scaling bug
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
Switch kde to use rfft, fix interlacing and integration
Fix isupport() to be insupport()
Merge remote-tracking branch 'origin/master' into wisharts
fix convolution
Update multivariate normal to the changes in CholeskyDense
Fix of mulitvariate normal to extract the upper cholesky factor.
fixes for updated cholfact
Merge branch 'master' of git://github.com/JuliaStats/Distributions.jl into wisharts
finishing fixes for new cholfact
Merge pull request #33 from danmerl/wisharts

Adding Wishart and Inverse Wishart pdfs and random deviates
changing function name capitalization and changing log(det(X)) to logdet(X).  I didn't change the log(det()) calls involving a CholeskyDense variable because logdet isn't defined for that class, and I'm making use of the fact that for a CholeskyDense variable, det returns the determinant of the original [unfactored] matrix.
Updating readme to include the new InvertedGamma, Wishart, and InverseWishart distributions