added new constructors for DiscreteDistribution
added new constructors for DiscreteDistribution

chharvey/chharvey.github.io,dev-chharvey/dev-chharvey.github.io,chharvey/chharvey.github.io,chharvey/chharvey.github.io,dev-chharvey/dev-chharvey.github.io,dev-chharvey/dev-chharvey.github.io