Added gammaln and incompleteBeta functions
Added gammaln and incompleteBeta functions

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