Update stylesheets: social links and class/method names in manual

Update mobile view for social links:
![zf-web-social-links](https://f.cloud.github.com/assets/103362/185694/0d3fa034-7d0f-11e2-8acd-48039ed49e40.png)

Update styles for class/method names:
![zf-web-methodname](https://f.cloud.github.com/assets/103362/185697/26296bca-7d0f-11e2-9c1d-b5125ce531e7.png)