partially done with new testing scripts
new testing framework with tests on discrete univariates
simplify discrete tests
more discrete distribution tests
remove old discrete testing files
simplify prepdref2.py
rename test/discrete.jl to test/univariates.jl
extend the new testing framework to continuous distributions
new framework fixed, now it works with Cauchy distributions
tested up to Logistic
all continuous distributions passed under new testing framework
add requirement of JSON package
Merge pull request #314 from JuliaStats/dh/test3

A new testing framework for univariate distributions