The 45 K Onset Superconductivity and the Suppression of the Nematic Order in FeSe by Electrolyte Gating*Supported by the National Natural Science Foundation of China under Grant Nos 11174294, 11174291, 11374302, 11304319, U1332209, U1432251 and U1532153, the China Postdoctoral Science Foundation under Grant No 2015M582020, the Program of Users with Excellence, the Hefei Science Center of Chinese Academy of Sciences, and the CAS/SAFEA International Partnership Program for Creative Research Teams of China. (May 2016)