Switched travis config to develop target so dependencies get installed
Switched travis config to develop target so dependencies get installed


Former-commit-id: 7044a006b2662f4a19da4f4dae1b347ed4656041
gsarma/PyOpenWorm,openworm/PyOpenWorm,openworm/PyOpenWorm,hnunner/PyOpenWorm,kaustubhcs/PyOpenWorm,gsarma/PyOpenWorm,travs/PyOpenWorm