don't show required step on top of detail submit step, show msg if app is public wo/ ratings

- Don't show "You need to get XXX" on top of the "Details" submission step since they're not there yet.
- If an app is public, but doesn't have ratings, display a fixed message onto of the devhub app page saying "You need to get ratings else your app might get disabled" 

![screen shot 2013-12-11 at 8 59 09 pm](https://f.cloud.github.com/assets/674727/1730664/274ed8d4-62ea-11e3-9782-684514432d3c.png)