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tokens: We thank the anonymous referee for helpful comments. M.L.W. and A.I.Z. acknowledge support from NSF grant AST-1211874. M.L.W. also thanks the Technology and Research Initiative Fund (TRIF) Imaging Fellowship program for its support. C.R.K. acknowledges support from NSF grant AST-1211385. K.C.W. is supported by an EACOA Fellowship awarded by the East Asia Core Observatories Association, which consists of the Academia Sinica Institute of Astronomy and Astrophysics, the National Astronomical Observatory of Japan, the National Astronomical Observatories of the Chinese Academy of Sciences, and the Korea Astronomy and Space Science Institute. Facilities: Mayall (Mosaic-I) , Blanco (Mosaic-II) , Magellan-1 (LDSS-2 , LDSS-3) , Magellan-2 (IMACS) , MMT (Hectospec) .