SWITCHYARD-1559: Create AS7 maven assembly for KIE/Drools/jBPM module dependencies

SWITCHYARD-1559: Create AS7 maven assembly for KIE/Drools/jBPM module dependencies
https://issues.jboss.org/browse/SWITCHYARD-1559
Note: Includes an upgrade of KIE/Drools/jBPM from 6.0.0.Beta3 to 6.0.0.Beta4