Help long titles wrap more cleanly

Long titles push themselves under the user avatar in the activity stream:

![long title](https://f.cloud.github.com/assets/449006/183419/67417c50-7c98-11e2-9173-e7e18e5962e2.png)

This change makes sure they wrap more cleanly, at the cost of adding an additional span to prevent the `a` target area from blocking.