HELIX-149: Allow clients to pass in preferred placement strategies
HELIX-154: Auto rebalance algorithm should not depend on state
HELIX-151: rb:13209 Allow nodes using floor capacity to steal a slot
reverting the changes to pom.xml that was commited by accident
HELIX-107 rb: 13193 Add support to set custom objects into ZNRecord
HELIX-169: add test case for handling consecutive zk session expiry
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-helix
HELIX-195: fix race condition between FINALIZE callbacks and zk callbacks, rb=13345