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Commits on May 1, 2012
  1. Added a gemspec and a license. Expanded the README. Fixed a really gn…

    committed
    …arly bug: ruby 1.8.7 responds to hash collisions differently to ruby 1.9.3 when calling Hash.invert. Had to make sure my test cases didn't test on anything that had a hash collision. It gives correct answers, it's just messy to test against. Easier to pick values that only appear once in the lookup table.
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