Fixed variance of MixtureModel
Passed on normalized probabilities to AliasTable
added support in variance for multivariate distributions
Binomial TPE sampler, KS test for discrete vars
Add Poisson samplers
Sampler type, Gamma samplers
Merge pull request #245 from JuliaStats/binom-rand

Sampler abstract type, implement julia Binomial and Poisson samplers.
rearrange Exponential methods
typo
sampler types moved to StatsBase
categorical samplers migrated out to StatsBase
require StatsBase 0.5 (using Sampling interface there)
depend on sampling
improve Laplace rand, rearrange methods
move binomial samplers out to Sampling.jl
Merge branch 'master' of https://github.com/JuliaStats/Distributions.jl
Add Coverage to travis
Add Coveralls badge to README
Merge pull request #249 from IainNZ/patch-1

Add coverage
move out sampler fallback