show time and IP address of last login for AMO users (bug 690284)

# if I'm logged in and looking at my profile (or if I'm an admin) 
![](http://cl.ly/image/373q2Z2q240P/Screen%20Shot%202013-09-12%20at%203.32.22%20PM.png)

# if I'm not logged in or I'm looking at someone else's profile
![](http://cl.ly/image/2e2J002m230U/Screen%20Shot%202013-09-12%20at%203.31.35%20PM.png)