added large number of qunit tests for distributions
added large number of qunit tests for distributions

JeebsM/jstat,ggonzale/jstat,NorthDecoder/jstat,jstat/jstat,jamescgibson/jstat,smarden1/jstat,JeebsM/jstat,NorthDecoder/jstat,jstat/jstat,smarden1/jstat,cmpolis/jstat,ggonzale/jstat,akrawitz/jstat,akrawitz/jstat