added handling for more than two condition groups into ballgown_fpkmgenematrix.R
added handling for more than two condition groups into ballgown_fpkmgenematrix.R

kbase/KBaseRNASeq,kbase/KBaseRNASeq,kbaseIncubator/KBaseRNASeq,kbase/KBaseRNASeq,kbase/KBaseRNASeq,kbaseIncubator/KBaseRNASeq,kbaseIncubator/KBaseRNASeq