Social layout : show site logo if defined, added link to user preferences in dropdown menu

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@51587 b456876b-0849-0410-b77d-98878d47e9d5
make user table responsive

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@51590 b456876b-0849-0410-b77d-98878d47e9d5
Removed .btn-sm from submit button

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@51591 b456876b-0849-0410-b77d-98878d47e9d5