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tokens: The work is jointly supported by the National Natural Science Foundation of China (41231068, 41304137, 41531073, and 41504132, 11575203) and the Specialized Research Fund for State Key Laboratories. X.L. acknowledges the support of the post-doctoral programme of the North-West University in South Africa. M.S.P. acknowledges the financial support of the South African National Research Foundation (NRF) under the Incentive and Competitive Funding for Rated Researchers, grants 87820 and 68198. M.Z. was supported in part by NASA Grants NNX14AJ53G and NNX15AN72G. This material is based upon work supported by the US National Science Foundation under Grant No. CNS 09-23050.