accuraterip-checksum: convert to python C extension

* calculate v1 and v2 checksums at once
* let libsndfile handle both WAV and FLAC

Signed-off-by: Andreas Oberritter <obi@saftware.de>

.travis.yml

@@ -23,11 +23,6 @@ install:
     # Testing dependencies
     - pip install twisted flake8
 
-    # Build bundled C utils
-    - cd src
-    - sudo make install
-    - cd ..
-
     # Installing
     - python setup.py install