Line numbers and log content should be aligned

This is a really small cosmetic issue, but notice it every time :eyes: 

![travis ci - free hosted continuous integration platform for the open source community 2013-11-20 12-11-20](https://f.cloud.github.com/assets/43297/1581372/7b3f459a-51d4-11e3-9027-f945f7939150.png)

There's a way around it by making `pre#log p a` `display: inline-block` and set a `width` or `min-width`, but I guess the clean way would be to do it like GitHub: change the template to use tables so the line number can share the same size.

What do you think? I'd be interested in sending a PR for either of those solutions.

Edit: Looks like someone had the same idea already: it's commented in the current code :) https://github.com/gregkare/travis-web/blob/d4ae21251eb69dc068162db25c33dc254964d5ac/assets/styles/main/log.sass#L35-L36