Remove JDepend Report: No support for Java 8

As mentioned here

http://forums.gradle.org/gradle/topics/fyi-jdepend-does-support-java-8

and here

clarkware/jdepend#7

`JDepend` does not support Java 8 and leads to messages like "Unknown constant: 18"
in Maven build. Thus removing the report.

pom.xml

@@ -382,11 +382,6 @@
  </execution>
  </executions>
  </plugin>
- <plugin>
- <groupId>org.codehaus.mojo</groupId>
- <artifactId>jdepend-maven-plugin</artifactId>
- <version>2.0</version>
- </plugin>
  <plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-surefire-plugin</artifactId>
@@ -632,10 +627,6 @@
  <groupId>org.jacoco</groupId>
  <artifactId>jacoco-maven-plugin</artifactId>
  </plugin>
- <plugin>
- <groupId>org.codehaus.mojo</groupId>
- <artifactId>jdepend-maven-plugin</artifactId>
- </plugin>
  <!-- Checkstyle: Static Code Analysis -->
  <plugin>
  <groupId>org.apache.maven.plugins</groupId>