Update to 0.11

Upstream changes:
0.11  Tue Aug 6 23:24:07 JST 2013
        - fix bug around crc calculation and footer generation. Thanks syohex-san

0.10  Fri Jul 19 10:42:33 JST 2013
        - replace IO::Compress with PM::Deflater::Encoder for performance improvement

0.09  Mon May 24 14:24:04 JST 2013
        - buffering a first chunk. It contains only the gzip header

0.08  Mon Jun 18 23:40:04 JST 2012
        - do compress->close instead of autoflush to write gzip footer

0.07  Mon Jun 11 17:13:20 JST 2012
        - added perlcriticrc, no code changes

0.06  Wed May 16 18:24:27 JST 2012
        - Support Streaming, Thank you ranguard.

(wen)