Added deletion of Orchestrator's SLING_HOME to Vagrant's bootstrap.sh.
jackrabbit-base (snapshot) must also be built because referred to by jackrabbit-server.
Crankstart now supports $${command}.

ModProxyConfigTransitioner can now stop the server on activate and on close.
Fixed CrankstartMinionController from logging "failed" when stopping Minions.

The exit value when killing a JVM seems to be 143, so changed Executor to reflect that. Also, onProcessComplete is called for successful completes only (i.e. 143 now), so no need to log failures there.
Replaced spaces with tabs for indentation.
Converted ZooKeeperInstanceMonitor to a component.
Converted ZooKeeperInstanceAnnouncer to a component.