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tokens: ACKNOWLEDGEMENTS We acknowledge support from the National Science Foundation through grant NSF-1108957. Support for Program numbers 12634 and 12575 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. AIZ acknowledges support from NSF grant AST-0908280 and NASA grant ADP-NNX10AD47G. TC and MD acknowledge partial support of NASA grant HST- GO-12065.01-A. The archival and Guest Observer data are based on observations made with the NASA/ESA Hubble Space Telescope, which is operated by the Space Telescope Science Institute.