Gallery trail fixes

- [Fixed] Gallery image counts: remove border and add horizontal space
- [Other] Clean up and refactor trails CSS

## Before

![screen shot 2013-10-07 at 12 06 11](https://f.cloud.github.com/assets/85783/1279795/9ed59a2e-2f40-11e3-92b6-1fa395c4cd91.PNG)

## After

![screen shot 2013-10-07 at 11 50 33](https://f.cloud.github.com/assets/85783/1279796/a2b13428-2f40-11e3-8704-c264f881689b.PNG)

![ ](http://s2.developerslife.ru/public/images/gifs/a8b8c028-8d6b-4973-8c5f-4dc2d5217817.gif)