Add a new maven project for droolsjbpm-integration containing OSGI stuffs

This is a new maven parent project containing modules : 
- Features (generate the xml feature file to deploy drools on karaf)
- itest (pax-exam integration test with karaf)
- example ( a camel drools example)
- karaf (uber jar file to deploy drools core, compiler, kie-api & kie-internal on karaf) - will be changed after drools kie, kie-internal & drools-spring packages refactoring
- kie-uber (uber jar file to deploy kie-api, kie-internal on karaf)

The project is not linked to parent pom of droolsjbpm-integration and will not polute existing project