Changing User.read API to default to active users.
Changing User.read API to default to active users.

refs #3542
- Properly handle forgotten screen (ember)
- Change Users API to only return active users on read
- Adjust tests

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