cityhash.64             Calculate hash value of input x using CityHash
                        https://code.google.com/p/cityhash/
murmur3.32              Calculate hash value of input x using Murmur3
                        https://code.google.com/p/cityhash/
spooky.32               Calculate hash value of input x using
                        SpookyHash
                        http://en.wikipedia.org/wiki/Jenkins_hash_function
