Small command line utility taking advantage of HyperLogLog to count distinct lines.
HyperLogLog: https://en.wikipedia.org/wiki/HyperLogLog
Murmur Hash 3 used in current implementation:
http://en.wikipedia.org/wiki/MurmurHash#MurmurHash3
Use tup to compile, count-distinct to see usage information.
Provides both temporary and persistent filters.