Upgrade ipython-cluster-helper version to 0.3.7.
Upgrade ipython-cluster-helper version to 0.3.7.

This has a fix in it to work on SLURM setups where there is
an account, but the user is not assigned to it and SLURM is
set up to not need an account passed to it.

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