upgrade jgrapht to 0.9.0

old version 0.8.3:
                               <groupId>net.sf.jgrapht</groupId>
                               <artifactId>jgrapht</artifactId>
                               <version>0.8.3</version>

new version 0.9.0:
                               <groupId>org.jgrapht</groupId>
                               <artifactId>jgrapht-core</artifactId>
                               <version>0.9.0</version>
Merge branch 'feature/swrlDatalog' of github.com:ontop/ontop into feature/swrlDatalog
generate linear recursive queries of correct structure