[HELIX-133] cleanup internal timer when timeout happens on the message
handling
fix test failire
refactor config-accessor, add external-command
[HELIX-7] fix intermitent test failures
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-helix
[HELIX-77] Applying patch from Max to clean up pom and separate unit tests from integration test
HELIX-16: Recipe for distributed task execution
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-helix
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-helix
don't include log4j.properties