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Funding for the activity that led to this publication was provided by General Motors, The Grainger Foundation, Microsoft Research, Defense Advanced Research Projects Agency, Air Force Office of Scientific Research, Department of Defense ASD(R&E)–Research Directorate-STEM Development Office, and Cummins Inc. This material is also based upon work supported by the National Science Foundation under Grant No.1202935. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. In addition, the content of this publication does not necessarily reflect the position or the policy of the Government and no official endorsement should be inferred.

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