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
Merge remote-tracking branch 'origin/master' into wisharts
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