Add Common.scala to share common settings across projects.

Move organization and version settings that are common across projects.
Reame receiveWithOperatingSystemMXBean to receiveWithMBeans.

The name receiveWithOperatingSystemMXBean is misleading because it takes multiple
MBeans to respond to queries.
Upgrade sbt version to 0.13.1.
Make test depends on scalastyle.

See: How to run scalastyle automatically on compile?
https://github.com/scalastyle/scalastyle-sbt-plugin/issues/11
Perform copyNativeLibraries before test.

Otherwise test fails to find sigar native library.
Launch ZooKeeper server only if necessary.

beyond.zookeeper.servers specifies the list of hosts to serve as ZooKeeper
server. Launch ZooKeeper server only if this host belongs to the list.
Remove unnecessary import.