CVE-2013-0162: Incorrect temporary file usage

The ruby_parser Gem does not create temporary files securely. In the diff_pp function contained in lib/gauntlet_rubyparser.rb function, it creates files as /tmp/a.[pid] and /tmp/b.[pid] which can be predicted and used for either a denial of service (file cannot be overwritten), or to change the contents of files that are writable.