Fix bullets position in standfirst

- [Fix] Bullets are aligned with the text in stand firsts
- [misc] Change `article-zone` into (changed to `article__zone`)
- [misc] Refactor fake bullet points mixin

## Before

![screen shot 2014-02-24 at 11 36 50](https://f.cloud.github.com/assets/85783/2245005/04e5b02c-9d48-11e3-8cbe-ded6c6a0eb1a.PNG)


## After

![screen shot 2014-02-24 at 11 37 05](https://f.cloud.github.com/assets/85783/2245006/081ba8d2-9d48-11e3-889b-e99ecb18eaae.PNG)

![ ](http://media.giphy.com/media/cGP2L3xFI5Wso/giphy.gif)