added rng for cauchy with basic test
added rng for chi square with basic test
added rng for exponential with basic test
added rng for gamm with basic test
added rng for lognormal with basic test
modified rng for normal
added rng for student-t with basic test
added rng for uniform with basic test
added rng for weibull with basic test
added rng for bernoulli with basic test
added rng for binomial with basic test
added rng for neg binomial with basic test
added rng for poisson with basic test