Sort the pairs output files before giving them back.
Sort the pairs output files before giving them back.

Some of the downstream tools expect paired FASTQ files to be
in order.

elkingtonmcb/bcbio-nextgen,verdurin/bcbio-nextgen,gifford-lab/bcbio-nextgen,verdurin/bcbio-nextgen,lpantano/bcbio-nextgen,hjanime/bcbio-nextgen,SciLifeLab/bcbio-nextgen,hjanime/bcbio-nextgen,a113n/bcbio-nextgen,brainstorm/bcbio-nextgen,guillermo-carrasco/bcbio-nextgen,mjafin/bcbio-nextgen,lbeltrame/bcbio-nextgen,elkingtonmcb/bcbio-nextgen,mjafin/bcbio-nextgen,biocyberman/bcbio-nextgen,lbeltrame/bcbio-nextgen,Cyberbio-Lab/bcbio-nextgen,fw1121/bcbio-nextgen,guillermo-carrasco/bcbio-nextgen,fw1121/bcbio-nextgen,chapmanb/bcbio-nextgen,brainstorm/bcbio-nextgen,lpantano/bcbio-nextgen,biocyberman/bcbio-nextgen,a113n/bcbio-nextgen,brainstorm/bcbio-nextgen,gifford-lab/bcbio-nextgen,Cyberbio-Lab/bcbio-nextgen,SciLifeLab/bcbio-nextgen,vladsaveliev/bcbio-nextgen,vladsaveliev/bcbio-nextgen,guillermo-carrasco/bcbio-nextgen,a113n/bcbio-nextgen,elkingtonmcb/bcbio-nextgen,verdurin/bcbio-nextgen,lbeltrame/bcbio-nextgen,fw1121/bcbio-nextgen,vladsaveliev/bcbio-nextgen,gifford-lab/bcbio-nextgen,hjanime/bcbio-nextgen,chapmanb/bcbio-nextgen,mjafin/bcbio-nextgen,chapmanb/bcbio-nextgen,biocyberman/bcbio-nextgen,SciLifeLab/bcbio-nextgen,lpantano/bcbio-nextgen,Cyberbio-Lab/bcbio-nextgen