agarie/measurable — pull request #12 by rossta (2014-04-02 12:34:04+00:00)
Title: Adds Levenshtein distance measure

As described in http://en.wikipedia.org/wiki/Levenshtein_distance

```ruby
Measurable.levenshtein('kitten', 'sitting')
=> 3
```

Useful for determining the edit distance between two sequences. Also works with arrays, which may be useful for comparing similarities between phrases, sentences, etc.