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tokens: OHP and MR acknowledge support from NASA grant NNX10AH10G, NSF CDI-typeII grant CMMI1125285, and the Theoretical and Computational Astrophysics Network (TCAN) grant AST1333514. The authors acknowledge the University of Maryland supercomputing resources ( http://www.it.umd.edu/hpcc ) made available in conducting the research reported in this paper. This work also used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by NSF grant number ACI-1053575. We thank the anonymous reviewer for helping improve the quality and clarity of this paper.