Update celery configuration to match latest specification and ensure configuration directory is on import path
Update celery configuration to match latest specification and ensure configuration directory is on import path

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