Fixing Google plus icon

git-svn-id: http://dev.piwik.org/svn/trunk@7765 59fd770c-687e-43c8-a1e3-f5a4ff64c105
Display social network report as pie chart by default

git-svn-id: http://dev.piwik.org/svn/trunk@7766 59fd770c-687e-43c8-a1e3-f5a4ff64c105