refactor output

completely subjective but I find some padding helps readability, fantastic tool! Thanks a lot for making this I was getting really sick of ab not working correctly :D

before:
![Screen Shot 2013-02-13 at 2 25 25 PM](https://f.cloud.github.com/assets/25254/154867/c09b8d44-762c-11e2-80b3-11d3fbc59cc0.png)

after:
![Screen Shot 2013-02-13 at 2 25 11 PM](https://f.cloud.github.com/assets/25254/154869/c4d81f62-762c-11e2-9a15-48e63fca87ff.png)