refactor helix-agent and add a simple test case
Adding license header to python files
HELIX-134: refactor helix manager to handle zk session expiry more reliably
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-helix
tempararily revert changes to HelixTaskExecutor.java, reset HelixTaskExecutor needs more refactoring including 1) handling InterruptedException carefully; 2) use of _lock and synchronized on manager instance in postMessageHandling
https://issues.apache.org/jira/browse/HELIX-131

Add configurable timeout value when creating a ZKHelixAdmin, in case the
ZKHelixAdmin is pointed to wrong zk address
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-helix