Merge: nitweb: rewritte stars

Upgrade the feedback stars form.

More stars and more details:

![image](https://cloud.githubusercontent.com/assets/583144/20892546/b0155e34-badc-11e6-8f89-726959021e5f.png)

Demo here: http://nitweb.moz-code.org/

Pull-Request: #2341

diff --cc share/nitweb/javascripts/nitweb.js
Simple merge