Added a check for CVE-2010-2489 and introduced a magic in operating
system check. When safe_os version is set to 'none' the version is
triggered as vulnerable.
Added a check for CVE-2009-4214
Added a check for CVE-2009-4124
Added a check for CVE-2009-4078
Added a check for CVE-2008-7248
Fixed Markdown