add size() and length() for distributions
Merge branch 'master' of https://github.com/JuliaStats/Distributions.jl into size
document size() and length()
fix bug in IsoNormalKnownSigma constructor
add missing argument to normalize! in one of the fit_mle  methods for Categorical variables
Merge pull request #216 from micklat/size

implement size() and length() for distributions
Merge pull request #218 from micklat/CategoricalNormalize

add missing argument to normalize! in one of the fit_mle methods
Merge pull request #217 from micklat/IsoNormalKnownSigma

fix bug in IsoNormalKnownSigma constructor