Commits on Oct 7, 2019

1. Introduce buzhash chunker …

   It has the same properties as Rabin but is much faster.
   Benchmark results:
   
   ```
   name             speed
   Buzhash2/1K-4    1.71GB/s ± 4%
   Buzhash2/1M-4    1.15GB/s ± 2%
   Buzhash2/16M-4    892MB/s ± 1%
   Buzhash2/100M-4   904MB/s ± 2%
   Rabin/1K-4       13.8MB/s ± 3%
   Rabin/1M-4        171MB/s ± 3%
   Rabin/16M-4       182MB/s ± 4%
   Rabin/100M-4      182MB/s ± 3%
   Default/1K-4     1.74GB/s ± 4%
   Default/1M-4     3.22GB/s ± 2%
   Default/16M-4    3.88GB/s ± 2%
   Default/100M-4   4.21GB/s ± 6%
   ```
   
   License: MIT
   Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

   Jakub Sztandera committed Oct 7, 2019
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2. Add test for buzhash …

   License: MIT
   Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

   Jakub Sztandera committed Oct 7, 2019
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3. Add buzhash to ipfs add docs …

   License: MIT
   Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

   Jakub Sztandera committed Oct 7, 2019
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4. fix(sharness): spelling

   

   Stebalien authored Oct 7, 2019
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