Ignore .ruby-* files
Add many basic files (README, CHANGELOG, .gemspec, etc)
Add version.rb file
Initial work to add existing CVE backports

- Rails: CVE-2013-0276
- Rails: CVE-2013-0277
- Ruby: CVE-2008-3790
- Ruby: CVE-2014-8080
Add a few unit tests

Also fix the cve-2014-8080 backport to work even if the String#bytesize method is not backported