Change java version from 1.6 to 1.8

Change-Id: I59ceef86400113efd8cfb0a21526e19b1b5bc87b

Author: ChristophEichhorn

pom.xml

@@ -165,8 +165,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.3</version>
                 <configuration>
-                    <source>1.6</source>
-                    <target>1.6</target>
+                    <source>1.8</source>
+                    <target>1.8</target>
                 </configuration>
             </plugin>
             <plugin>