Added debug log to Base model: `emitChange`
Added debug log to Base model: `emitChange`

no issue

- helpful for debugging model events
- DEBUG=ghost:models:base node index.js

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