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tokens: P.N. acknowledges support from a Theoretical and Computational Astrophysics Network grant, award number 1332858, from the National Science Foundation. This work was completed at the Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1066293. Useful conversations with Benny Trakhenbrot and Nicholas Stone at the Aspen Black Holes Workshop are gratefully acknowledged. B.A. and A.R. acknowledge support from the TCAN grant for a post-doctoral fellowship and a graduate fellowship, respectively. This research was supported in part (AF) by the National Science Foundation under Grant No. NSF PHY11-25915. E.Z. acknowledges funding from the Swedish Research Council (project 2011-5349). N.C. acknowledges the YCAA Prize Postdoctoral fellowship. N.C. and F.P. acknowledge the SAO Chandra grant AR6-17017B and NASA-ADAP grant MA160009.