Added sonar build plugin explicitly in the pom file

Author: jgebal

pom.xml

@@ -209,6 +209,11 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.sonarsource.scanner.maven</groupId>
+                <artifactId>sonar-maven-plugin</artifactId>
+                <version>5.1.0.4751</version>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-plugin-plugin</artifactId>