simplify header when page is <iframe>'d

# `<iframe>`'d
![](http://f.cl.ly/items/1M3a0u0i3v2H1w3L0S2u/Screen%20Shot%202014-01-22%20at%205.58.14%20PM.png)

# full page

![](http://f.cl.ly/items/141k0B35400Q0Y3U3o0B/Screen%20Shot%202014-01-22%20at%206.00.28%20PM.png)

Let me know your thoughts. Thanks!