CI update

Merge pull request bsm#82 from segmentio/return_error

Return error instead of returning nil

Release partitions only after we have started consuming them all

Init config with minVersion

Close consumer first

Merge pull request bsm#64 from bsm/fix/close-without-rebalance

Allow closing consumers even if rebalance fails

Merge pull request bsm#12 from dolzenko/master

Fix config normalization

Always propagate partition-consumer errors to the cluster consumer

Silence go1.3 race detector

First stable release