Include CRC32 in benchmarks on website

Looking at benchmarks table on main website I noticed lack off most popular check sum on internet, namely CRC32. Although it's not a hash but checksum but 'bandwidth speed' in this table refers to hashes being used add check sums, hence proposition to include CRC.

Here is improvised patch with it.

Also, suggetion to a bench - every test should anounce units it uses, as these numbers don't mean much, if anything, without it.

benchmarking large inputs : from 512 bytes (log9) to 128 MB (log27) [MB/s]:
Throughput small inputs of fixed size (from 1 to 30 bytes) [#/s]:
benchmarking random size inputs [1-N] ???: