LIVEOAK-300 Separate development launch environment for running LiveOak

Added launcher assembly that allows 'embedded' usage of LiveOak WildFly distribution.
By making a copy of dist/target/launcher anywhere on the filesystem you establish a new LiveOak environment with its own conf, data, apps, and client.

To run it use launcher/liveoak.sh which has a hardcoded location to dist/target/liveoak, but can also be pointed to another WildFly location by setting JBOSS_HOME env variable.

Usage:

    mvn clean install -DskipTests
    cp -r dist/target/launcher $LIVEOAK_HOME
    $LIVEOAK_HOME/liveoak.sh

Where LIVEOAK_HOME is any accessible location on the filesystem.