Upgrading Ruby to 1.9.3-p484

Upgrading per
https://www.ruby-lang.org/en/news/2013/11/22/heap-overflow-in-floating-point-parsing-cve-2013-4164/
Merge pull request #5 from kmwhite/security-upgrade_ruby_version_to_1_9_3_484

Upgrading Ruby to 1.9.3-p484