Merge remote-tracking branch 'hjue/master'
Add other social network badges for the Rock template.

Corrected the path in screen.css to show other badges, and the settings.php to be easily customizable.
Changed the email icon to a more appropriate version (round)

The ico came from http://www.softicons.com/social-media-icons/new-social-media-icons-by-mohamed-elgharabawy/email-icon
Merge pull request #48 from Chouffy/master

Add other social network badges for the Rock template.