Make .cabal file readier for Hackage
Replace MD5 with Murmur2 (smaller dep footprint) #27
Correct long string description to match input data
Merge murmur hashing (#27)

The new algorithm (and the way it's built in into the library) is about
three times faster as before in the Hashed and Shown modes, and brings
in no new dependencies at all. On the other hand, MD5 required a few
crypto libs.