Correct mode for NormalInverseChisq and NormalInverseGamma
Merge pull request #21 from JuliaStats/dfk/norminvgamma-mode Use correct formula for normal-inverse chi2 mode and normal-inverse gamma mode
Merge pull request #21 from JuliaStats/dfk/norminvgamma-mode Use correct formula for normal-inverse chi2 mode and normal-inverse gamma mode