[0.4.0] ~ 10/07/2016
- Added:    Sift3 distance + tests

[0.3.0] ~ 30/06/2016
- Added:    Damerau Levenshtein distance + tests

[0.2.0] ~ 28/06/2016
- Added:    Hamming distance + tests
- Added:    DistanceError enum
- Changed:  distance::levenshtein() now returns an usize instead of an i32

[0.1.0] ~ 28/06/2016
- Added:    Levenshtein distance algorithm
- Added:    Tests for the Levenshtein algorithm