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tokens: We thank Tobi Heinemann, Ben Chandran, Phil Isenberg, and, in particular, Matt Kunz for fruitful discussions. E.Q. is supported in part by NASA HTP grant NNX11AJ37G, NSF grant AST-1333682, a Simons Investigator award from the Simons Foundation, the David and Lucile Packard Foundation, and the Thomas Alison Schneider Chair in Physics. M.R. thanks support from the Chilean Comisión Nacional de Investigación Científica y Tecnológica (CONICYT; Proyecto Fondecyt Iniciación No. 11121145). D.V. is supported in part by NASA HTP grant NNX11AJ37G and NASA grant NNX12AB27G.