Change require_relative with require to rescue ruby 1.9.3
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Merge pull request #20 from otahi/rescue_ruby_1_9_3

Replace require_relative with require to rescue Ruby 1.9.3
Merge pull request #21 from otahi/make_readme_markdown

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Merge branch 'convert-more-filenames-to-snakecase' of github.com:keithrbennett/dnsruby into convert-more-filenames-to-snakecase
Renamed (again) Cache.rb to cache.rb.