[config] Allow using kafka registered at chroot
[config] Add default value for ZK chroot
Added config param for rebalance retries and local log file auto-cleaup logic

updated
Support date partitioning with JSON data.
Added contributors
Changed formatting
Added compression feature.

By setting:

  `secor.compression.codec=org.apache.hadoop.io.compress.GzipCodec`

you can enable Gzip compression for the target data.
Merge system config with file config.

This permits overriding options from the command line.