Merge pull request #4 from stevegt/master

fix split_file_by_fingerprints() return values
first draft of streaming test;
streaming from dd file
randomize test_Rabin.py block size
add more tests
finish streaming test
add test_all.sh
Merge pull request #5 from stevegt/master

get callback working and tested
Merge pull request #6 from stevegt/streaming

Add more tests