Commits on Nov 6, 2019

1. Improve performance of buzhash …

   ```
   name             old time/op    new time/op    delta
   Buzhash2/1K-4       610ns ± 4%     643ns ±16%    ~     (p=0.421 n=8+10)
   Buzhash2/1M-4      1.25ms ± 5%    1.16ms ± 4%  -7.31%  (p=0.000 n=10+10)
   Buzhash2/16M-4     19.2ms ± 2%    17.5ms ± 2%  -8.73%  (p=0.000 n=9+9)
   Buzhash2/100M-4     117ms ± 1%     107ms ± 3%  -8.26%  (p=0.000 n=10+10)
   
   name             old speed      new speed      delta
   Buzhash2/1K-4    1.68GB/s ± 4%  1.60GB/s ±14%    ~     (p=0.408 n=8+10)
   Buzhash2/1M-4     842MB/s ± 5%   908MB/s ± 3%  +7.86%  (p=0.000 n=10+10)
   Buzhash2/16M-4    875MB/s ± 2%   959MB/s ± 2%  +9.57%  (p=0.000 n=9+9)
   Buzhash2/100M-4   897MB/s ± 1%   977MB/s ± 3%  +9.02%  (p=0.000 n=10+10)
   
   name             old alloc/op   new alloc/op   delta
   Buzhash2/1K-4      1.17kB ± 1%    1.17kB ± 0%  -0.50%  (p=0.006 n=10+10)
   Buzhash2/1M-4      1.08MB ± 1%    1.07MB ± 0%    ~     (p=0.739 n=10+10)
   Buzhash2/16M-4     17.1MB ± 0%    17.1MB ± 0%    ~     (p=0.579 n=10+10)
   Buzhash2/100M-4     106MB ± 0%     106MB ± 0%  -0.01%  (p=0.000 n=9+7)
   
   name             old allocs/op  new allocs/op  delta
   Buzhash2/1K-4        3.00 ± 0%      3.00 ± 0%    ~     (all equal)
   Buzhash2/1M-4        8.00 ± 0%      8.00 ± 0%    ~     (all equal)
   Buzhash2/16M-4       72.0 ± 0%      72.0 ± 0%    ~     (all equal)
   Buzhash2/100M-4       406 ± 0%       406 ± 0%    ~     (all equal)
   ```
   
   License: MIT
   Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

   Jakub Sztandera committed Nov 6, 2019
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