Storing package metadata in repository in order to know how to run packages from the repository.
Fixed eu.semantiq.easyrider.builder.GitWorkingCopyTest.
AppBuilder responds to configuration updates.
Refactoring:
 - introducing supervisor package, for actors concerned with keeping the application running
Using git hash as package version.
Implementation of AppSupervisor t handle package/config changes.
Fixed warning about akka.loggers.