Links fixes

- [fix] Prevent hover effect to be a double underline in Firefox
- [new] Remove effects on links triggered on touch / scroll
- [new] Use borders instead of underline for in body links

Thanks to @Nico3333fr for the tip with the `:active` state.

## Before

![screen shot 2014-02-25 at 21 11 32](https://f.cloud.github.com/assets/85783/2263073/6ea53c84-9e61-11e3-8ffe-60cfc127ac6e.PNG)


## After

![screen shot 2014-02-25 at 21 11 22](https://f.cloud.github.com/assets/85783/2263074/7248281a-9e61-11e3-82a8-324e5e06f2b2.PNG)


## In body links with border:

### Normal

![screen shot 2014-02-26 at 14 35 34](https://f.cloud.github.com/assets/85783/2270873/8449f862-9ef3-11e3-876e-06c8e0dd570c.PNG)


### Hover

![screen shot 2014-02-26 at 14 35 41](https://f.cloud.github.com/assets/85783/2270868/74e8a2ce-9ef3-11e3-883c-3ec96e0cc379.PNG)


### Active

![screen shot 2014-02-26 at 14 36 00](https://f.cloud.github.com/assets/85783/2270869/777e4a34-9ef3-11e3-9168-68d04f9aa8c2.PNG)





![ ](http://s1.developerslife.ru/public/images/gifs/8a0180a4-1ef0-4ac3-b67d-12fa8fb497a7.gif)