Extended api/index.js to export all available api versions
Extended api/index.js to export all available api versions

refs #9866

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