Log Message:
Update to 0.21

Upstream changes:
0.19  Sun Feb  8 11:30:09 2015
        - fixed issue with OO crc64, #101999
        - remove Build.PL as it seems to have some issues with the XS support

0.20  Sun Feb  8 16:45:13 2015
          - removed debug code

0.21  Sat Feb 21 13:18:25 2015
          - new() throwing an error if an unsupported type is specified