disabled discussion tweaks

- disable commentcounts when discussion is switched off
- show an alternate template in place of discussion to inform users

![image](https://cloud.githubusercontent.com/assets/960919/4848828/168b0696-605d-11e4-800f-5d45fd0bbb86.png)

no changes to the core/existing discussion template here, only whitespace and formatting. lines 117+ are new