Fixed benchmark data generation. Benchmarks results are within the same magnitude that they were before; but they are now testing the worst cases as intended.
Talk: https://go-talks.appspot.com/github.com/xtblog/gotalks/sets.slide
Documentation: http://godoc.org/github.com/xtgo/set
Package set provides type-safe, polymorphic mathematical set operations that operate on any sort.Interface implementation.