remove opening and closeing events from key events panel

Remove 'Latest Post' and 'Opening post' from live blog key events panel ( The two events indicated in the before ) 

Before:
![with-latest](https://cloud.githubusercontent.com/assets/986155/4355907/b6045c32-4252-11e4-8a41-4670ae89dba9.png)

After:

![no-latest](https://cloud.githubusercontent.com/assets/986155/4355913/c53d7a94-4252-11e4-8ad3-1ddaa52d9b65.png)