little tweaks to like counts in topic list view

- like counts use number formatting (so 1100 is 1.1K like other counts)
- made 'likes' column wide enough to hold 3 digit and > 999 likes
- right-aligned likes so that heart icon stacks vertically
- swapped views and likes columns 
- icon nicely separates counts from activity (IMHO)

![topic-likes](https://f.cloud.github.com/assets/2217652/756341/5fcd65a8-e604-11e2-9862-9a3724aa4e90.PNG)