Convert probabilities to floats
Use a copy of the `p` argument in `Categorical` constructor.
Merge pull request #74 from JuliaStats/db/categorical

Use a copy of the `p` argument in `Categorical` constructor.  This allows Ints to be used for the argument.  Also made the code somewhat terser
Added alias table and Huffman coding tree for sampling discrete vars. Alias table has best performance, so replaces drawtable in Categorical & Multinomial.
Merge pull request #76 from simonbyrne/huffman

Huffman coding tree for sampling discrete vars
entropy for fdistribution
Merge pull request #78 from simonbyrne/fdist

entropy for fdistribution
Move glmtools.jl and other methods to the GLM package.
tweaks to entropies
Merge pull request #80 from simonbyrne/entropy

tweaks to entropies
Add skewness and kurtosis for FDist. Fix pventropy calls.
Dynamically switch between alias table and sequential binomial sampling
introduce a dim function for getting sample dimension of a multivariate distribution
Comment out vestigial tests and define xlogx anew
Move glmtools.jl to GLM package and clean up.
Corrected typo
rename fit to fit_mle, and delegate fit to fit_mle
Merge branch 'master' of https://github.com/JuliaStats/Distributions.jl
add the statement to install NumericExtensions in travis.yml (this should fix the travis failure)
substantial expansion of readme