Introduce "External Dictionary" de/compression API
fixed : read error into fuzzer
modified : rand generator
fixed : allocation within fuzzer
new command line options for fuzzer (see -h)
fuzzer : added compressibility parameter (-p#)
Add (modified, stripped) FarmHash 1.0.0
Refactor hash function selection

 - Add proper macro for hash function/states.
 - Decrease number of #if by hash function/state macros.