Fix memory leak in compress zlib/lzo column
Merge pull request #221 from naoa/fix-memory-leak-in-zlib/lzo

Fix memory leak in compress zlib/lzo column
Fix wrong zlib/lzo support reporting in --version
Fix a bug that "int8_column_value <= 100" may return true in --filter

GitHub: fix #219

It is caused by comparison between in signed integer and unsigned
integer. This change makes all integer literals are treated as signed
integer (Int32 or Int64).

See added test for reproducible case.
package debian: fix wrong configuration file
package debian: fix wrong default PID file path
package debian: create PID file directory automatically
Add LZ4 compression instead of LZO compression
Merge pull request #223 from naoa/add-lz4-compression

Add LZ4 compression instead of LZO compression

Patch by Naoya Murakami. Thanks!!!
Keep backward compatibility for LZO remove
Share common code
lz4: add max size check
lz4: use "lz4_" prefix instead of "l"
lz4: break a long line
lz4: introduce "packed_value" and "packed_value_len" variables for readability

Because "lz4_value" and "lz4_value_len" didn't represent LZ4 compressed
data.
lz4: use more readable name
lz4: fix function name in error message
fix lz4 support reporting in --version

* In #223, lzo compression support dropped and add lz4 compression support.
Merge pull request #224 from cosmo0920/fix-support-reporting-lz4

fix lz4 support reporting in --version

Patch by Hiroshi Hatake. Thanks!!!
mruby: follow weight number may be int32 change