Container timestamp space fix

I was trying to do something clever but as we are adding timestamp everywhere and comments are added by JS this is the best solution.

Before:
![screen shot 2014-11-06 at 11 54 49](https://cloud.githubusercontent.com/assets/2579465/4935633/64a96fe6-65af-11e4-9e98-52cf20ed7afe.png)

After:
![screen shot 2014-11-06 at 12 05 01](https://cloud.githubusercontent.com/assets/2579465/4935634/64ad8ff4-65af-11e4-8c3d-afd7f3d2ee0b.png)


Big specificity but as this is really an edge case it's all right (and properly documented).

@mattosborn @rich-nguyen While working on this I thought about removing empty spans from scala template comments and add it to the JS template. Articles with comments are somewhere between 70-80% so it probably can save some data transferred down the line and as we are accessing DOM by adding comments count there should not be any performance downside.