Upgraded Maven plugin versions
Upgraded Maven plugin versions

- Build Helper Maven Plugin v1.10
- Findbugs Maven Plugin v3.0.3
- JaCoCo Maven Plugin v0.7.5.201505241946
- CodeHaus GMaven Plugin v2.0
- Maven Assembly Plugin v2.6
- Maven Checkstyle Plugin v2.17
- Maven Clean Plugin v3.0.0
- Maven Compiler Plugin v3.5
- Maven FailSafe Plugin v2.19.1
- Maven PMD Plugin v3.6
- Maven Project Info Reports Plugin v2.8.1
- Maven Release Plugin v2.5.3
- Maven SureFire Plugin v2.19.1
- Nexus Stating Maven Plugin v1.6.6

ldp4j/ldp4j,ldp4j/ldp4j