Remove margin from ul.no-bullet

I think it's common for people to set `$list-side-margin` to `1.25em` (or so) so the bullets from their lists do not go outside of their grid.

However, I think it doesn't work very well on `ul.no-bullet` where it looks a bit awkward. The items have a margin, but no bullet.

This PR removes the side margin on `ul.no-bullet`:

![ul no-bullet](https://f.cloud.github.com/assets/188390/977454/51699886-06a4-11e3-9149-314c4e7fbbd1.png)