thanks for sharing your work!
I have two suggestions to your maven setup:
The maven dependency published on the website seems wrong, it should be version 1.8.0, and not 1.8:
<dependency>
<groupId>grph</groupId>
<artifactId>grph</artifactId>
<version>1.8.0</version>
</dependency>
Also, could you publish a complete pom file, including the imported dependencies you use? Now I get a conflict in my java project caused by the fact that we are using different versions junit, but I am not able to override this in my maven setup.
Thanks!
Regards,
Martin