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tokens: We thank the anonymous referee for useful comments on the paper. AT and RM acknowledge the support of NASA ROSES 12-EUCLID12-0004. We thank Rachel Bean, Jonathan Blazek, Nick Gnedin, Katrin Heitmann, Michael Schneider, and other member of the LSST-DESC collaboration for providing helpful feedback on this work. TDM has been funded by the National Science Foundation (NSF) PetaApps, OCI-0749212 and by NSF AST-1009781 and ACI-1036211. AK was supported in part by JPL, run under a contract by Caltech for NASA. AK was also supported in part by NASA ROSES 13-ATP13-0019. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a DOE Office of Science User Facility supported by the Office of Science of the US Department of Energy under Contract No. DE-AC02-05CH11231.