Added sample method to weibull distribution
Added sample method to weibull distribution

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