Update shaarli.css

Added word-wrap: break-word; to body, so that that text is well wrapped, and do not permit horizontal scroll-bars (on mobile, with responsive design).
Merge pull request #166 from timovn/patch-1

Update shaarli.css
[add] visual image for private link
Merge branch 'master' of git://github.com/sebsauvage/Shaarli
Merge branch 'master' into myShaarli