Document Jenkins vulnerabilities

Security: CVE-2014-3661
Security: CVE-2014-3662
Security: CVE-2014-3663
Security: CVE-2014-3664
Security: CVE-2014-3680
Security: CVE-2014-3681
Security: CVE-2014-3666
Security: CVE-2014-3667
Security: CVE-2013-2186
Security: CVE-2014-1869
Security: CVE-2014-3678
Security: CVE-2014-3679