Tweaks for supervisor and reviewing

Added badge to review menu link, fixed declined challenges list, made alerts for supervisor more clear
![screen shot 2013-06-11 at 17 16 32](https://f.cloud.github.com/assets/536975/641775/b38788a8-d340-11e2-9312-7fe4b40f3f2b.png)
![screen shot 2013-06-11 at 17 10 07](https://f.cloud.github.com/assets/536975/641776/b39b179c-d340-11e2-9a8b-4df4706038ee.png)
![screen shot 2013-06-11 at 17 11 01](https://f.cloud.github.com/assets/536975/641777/b3ada70e-d340-11e2-9ea4-ab1168767139.png)
![screen shot 2013-06-11 at 17 10 21](https://f.cloud.github.com/assets/536975/641778/b3af0fcc-d340-11e2-9489-4f9f5814f318.png)