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tokens: This research was enabled in part by support provided by WestGrid ( www.westgrid.ca ) and Compute Canada Calcul Canada ( www.computecanada.ca ), and by the National Science Foundation under Grant No. 1066293 to the Aspen Center for Physics. AB, FD and LL acknowledge support from NSERC (Canada) through the Discovery Grant program. RD acknowledges support from the South African Research Chairs Initiative and from NASA grant NNX12AH86G. NSK and MAF acknowledge support from NATA ATP grant NNX10AJ95G and NSF grant AST-1009652, respectively, to the University of Massachusetts. TQ was partially supported by NSF award AST-1311956. We would like to thank Shuiyao Huang and Jared Gabor for helpful discussions, and RD, AB and FD would like to acknowledge the simulating collaborative atmosphere of the Aspen Center for Physics, where this work was completed. Finally, we would like to thank the anonymous referee for valuable comments that improved the clarity of the paper, as well as M. L. Balogh, J. M. Gabor and A. H. Gonzalez for providing us with access to detailed observational and simulation results in advance of publication.