🐛 Removed Casper's gulpfile from npmignore (#8880)
🐛 Removed Casper's gulpfile from npmignore (#8880)

no issue

- Don't exclude Casper's gulpfile when packaging Ghost to npm.
bitjson/Ghost,TryGhost/Ghost,kevinansfield/Ghost,JohnONolan/Ghost,BlueHatbRit/Ghost,acburdine/Ghost,kevinansfield/Ghost,mohanambati/Ghost,cwonrails/Ghost,janvt/Ghost,ErisDS/Ghost,chevex/undoctrinate,dbalders/Ghost,Gargol/Ghost,Kikobeats/Ghost,e10/Ghost,ErisDS/Ghost,cwonrails/Ghost,mohanambati/Ghost,JohnONolan/Ghost,dbalders/Ghost,acburdine/Ghost,ErisDS/Ghost,janvt/Ghost,kevinansfield/Ghost,TryGhost/Ghost,BlueHatbRit/Ghost,mohanambati/Ghost,JohnONolan/Ghost,bitjson/Ghost,TryGhost/Ghost,Gargol/Ghost,cwonrails/Ghost,dbalders/Ghost,Kikobeats/Ghost,acburdine/Ghost,Kikobeats/Ghost,e10/Ghost