Redirect authors and editors away from debug page
Redirect authors and editors away from debug page

A signed in user with role author or editor will be redirected back to
/ghost.

closes #3292

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