Remove jshint rules that are no longer supported
Remove jshint rules that are no longer supported

No Issue
- grunt-contrib-jshint@0.11.0.
- remove error about browser global Notification being redefined.

acburdine/Ghost-Admin,kevinansfield/Ghost-Admin,kevinansfield/Ghost-Admin,JohnONolan/Ghost-Admin,JohnONolan/Ghost-Admin,airycanon/Ghost-Admin,airycanon/Ghost-Admin,TryGhost/Ghost-Admin,TryGhost/Ghost-Admin,dbalders/Ghost-Admin,acburdine/Ghost-Admin,dbalders/Ghost-Admin