Tags in headlines

Also makes the colour of the link to comments follow the tone of the item, as per the new design spec.

![screen shot 2014-08-18 at 14 08 33](https://cloud.githubusercontent.com/assets/85783/3952221/dc5781f4-26df-11e4-8ea0-db93f92b23a2.PNG)
![screen shot 2014-08-18 at 14 07 05](https://cloud.githubusercontent.com/assets/85783/3952222/dc5b9fc8-26df-11e4-9643-c5c0b6badb86.PNG)
![screen shot 2014-08-18 at 14 05 56](https://cloud.githubusercontent.com/assets/85783/3952224/dc612970-26df-11e4-8446-4d18c74fa7c6.PNG)
![screen shot 2014-08-18 at 13 54 26](https://cloud.githubusercontent.com/assets/85783/3952223/dc5f75f8-26df-11e4-8c2e-0b3e56145a65.PNG)

![ ](http://media.giphy.com/media/1VqmDm4AHb5S0/giphy.gif)
:punch: nice use of `currentColor`!