Comments fixes

Fixes:

- On Swipe, comments sometimes truncate due to #preloads scrollTop not being 0 (screenshot)
- Links in byline Tab should now work again

![comments-truncate](https://f.cloud.github.com/assets/518943/1074396/e9bb5d68-14b9-11e3-85d9-a9971b866f05.png)