fix next steps page, iarc form layout, missing interactives columns

- Next steps page (under iarc waffle) was calling ```is_public_waiting``` when that method didn't exist.
- Fix form (form with security code/IARC ID) layout on content ratings page
- Was missing ```has_social_networking``` column for ```webapps_rating_interactives```
![screen shot 2013-11-12 at 12 36 53 pm](https://f.cloud.github.com/assets/674727/1525873/e0c12a18-4bdb-11e3-81d8-cbcf087c9f72.png)