KAFKA-992 Double Check on Broker Registration to Avoid False NodeExist Exception; reviewed by Neha Narkhede and Swapnil Ghike
Misc. minor house-keeping fixes: add reasonable GC settings, fix up README, fix up example configs, fix the logging for tools, use a log directory for logs instead of the root directory.
KAFKA-992 follow up. Fix broken unit test
kafka-989; Race condition shutting down high-level consumer results in spinning background thread; patched by Phil Hargett; reviewed by Jun Rao
KAFKA-999 Controlled shutdown never succeeds until the broker is killed; reviewed by Neha Narkhede
kafka-1003; ConsumerFetcherManager should pass clientId as metricsPrefix to AbstractFetcherManager; patched by Swapnil Ghike; reviewed by Jun Rao
KAFKA-992 follow up: Fix the zookeeper de-registration issue for controller and consumer; reviewed by Neha Narkhede
Revert "KAFKA-992 follow up: Fix the zookeeper de-registration issue for controller and consumer; reviewed by Neha Narkhede"

This reverts commit 81c49bbdae5e490f9d5dc7b042ee60e617fbb22b.
KAFKA-992 followup: Fix zookeeper de-registration bug for controller and consumer; reviewed by Neha Narkhede
kafka-1010; Concurrency issue in getCluster() causes rebalance failure and dead consumer; patched by Sam Meder; reviewed by Jun Rao
kafka-992; follow-up patch; Double Check on Broker Registration to Avoid False NodeExist Exception; patched by Guozhang Wang; reviewed by Neha Narkhede and Jun Rao
Merge branch 'upstream-0.8' into 0.8-scala2.10

Conflicts:
	bin/kafka-run-class.sh
debian ver++