The e-MERGE Survey (e-MERLIN Galaxy Evolution Survey): overview and survey description by Muxlow, TWB, Thomson, AP, Radcliffe, JF, Wrigley, NH, Beswick, RJ, Smail, I, McHardy, IM, Garrington, ST, Ivison, RJ, Jarvis, MJ, Prandoni, I, Bondi, M, Guidetti, D, Argo, MK, Bacon, D, Best, PN, Biggs, AD, Chapman, SC, Coppin, K, Chen, H, Garratt, TK, Garrett, MA, Ibar, E, Kneib, J-P, Knudsen, KK, Koopmans, LVE, Morabito, LK, Murphy, EJ, Njeri, A, Pearson, C, Perez-Torres, MA, Richards, AMS, Rottgering, HJA, Sargent, MT, Serjeant, S, Simpson, C, Simpson, JM, Swinbank, AM, Varenius, E, Venturi, T