Provides Ruby 1.8.7-p374 with a patch for recent security vulnerability

  * Fixes "Heap Overflow in Floating Point Parsing (CVE-2013-4164)" in Ruby 1.8.7-p374
  * Patch can be found here: https://railslts.com/files/ruby-1_8_7p374-fix-overflow-point-parsing-cve-2013-4164.patch
  * Install: rbenv install 1.8.7-p374-fix-overflow-point-parsing
  * Use [decide whether you might want global/shell]: rbenv local 1.8.7-p374-fix-overflow-point-parsing

You can test the patch by running `10.times { ("1."+"1"*300000).to_f }` within an irb.