don't show required step on top of detail submit step, show msg if app is public wo/ ratings (bug 949728)


- 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 2013-12-13 at 4 17 34 pm](https://f.cloud.github.com/assets/674727/1747262/26f673ee-6455-11e3-9fc9-f97f050d30b1.png)