(RE-2037) Update puppet-win32-ruby for Ruby 2.1

This commit adds Ruby 2.1.5 64-bit built from our fork
of rubyinstaller.
Merge pull request #75 from geoffnichols/RE-2037/2.1.x-x64/update_for_ruby_2_1_5

(RE-2037) Update puppet-win32-ruby for Ruby 2.1