Revert "Fix PartitionConsumer race condition on Close. (#258)"

This reverts commit 6230ffb.

Merge pull request #215 from georgeteo/gteo/fix-reset-offet-npe

Fix NPE on ResetOffsets and MarkOffsets

New release

Merge pull request #201 from bsm/feature/drain-channels

Drain channels on Close

Fix deps

Merge pull request #184 from bsm/fix/safe-close

Make Close thread-safe

Merge pull request #125 from bsm/fix/commit-less

Partially revert #117. Force-commit when Consumer.Offsets.Retention i…

Test with Kafka 0.9

Merge pull request #117 from bsm/fix/commit-every-time

Commit every time, even if not dirty.

Merge pull request #102 from bsm/feature/regexp-subscriptions

Allow to subscribe to topics via regular expressions