added create-overlap-relations-stemcell task 
added create-overlap-relations-stemcell task 



Former-commit-id: dfa515d7710cc2f6b1c4ed8d082c14d2f8fc737e
julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine