Updated get/set metadata fn signatures
Updated get/set metadata fn signatures

no-issue

This is to reflect an upstream change in members-api

kevinansfield/Ghost,e10/Ghost,e10/Ghost,JohnONolan/Ghost,Kikobeats/Ghost,Kikobeats/Ghost,ErisDS/Ghost,kevinansfield/Ghost,JohnONolan/Ghost,janvt/Ghost,ErisDS/Ghost,janvt/Ghost,bitjson/Ghost,ErisDS/Ghost,TryGhost/Ghost,kevinansfield/Ghost,TryGhost/Ghost,JohnONolan/Ghost,TryGhost/Ghost,Kikobeats/Ghost,bitjson/Ghost