Added a link to Learn Ruby The Hard Way

It's a really good manual, I'm surprised it's not on the list already.
create announcement of CVE-2013-4073
added release note of ruby-2-0-0pXXX
rename
first translation for cve-2013-4073
fix announce paragraph
added 1.9.3p447 release announcement
refine announcements
rename and modified release date
2.0.0p247
increase patchlevel
added release announcements of 1.8.7p373
fix announce date for cve-2013-4073
added size and checksums for 1.8.7p373
added size and checksums for 2.0.0p247
added size and checksums for 1.9.3p448
added patchlevels
update latest package infomation
rename and increase revisions
translated title