Remove exempt orgs thumbnails

• Remove unnecessary code from not_live page
• Remove nested css for that section on for exempt orgs
• Update styles for adjacent elements to fix layout
• Remove unsed code from helper
• Remove rake task for generating thumbnails

https://www.agileplannerapp.com/boards/105200/cards/5218

Before and after screenshots attached
![screen shot 2014-11-03 at 14 15 23](https://cloud.githubusercontent.com/assets/1692222/4883650/03816e14-6364-11e4-9053-aa8326c15f67.png)
![screen shot 2014-11-03 at 14 15 35](https://cloud.githubusercontent.com/assets/1692222/4883651/038c1cf6-6364-11e4-830f-5ac5b2788121.png)