Fixed improper class path setting

---
class path was missing direct reference to log4j which caused class not found exception when running on remote devices via eclipse

ws4d-jcoap-handsOn/.classpath

@@ -3,5 +3,7 @@
 	<classpathentry kind="src" path="src"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6"/>
 	<classpathentry kind="lib" path="lib/jcoap-core-1.1.2.jar" sourcepath="lib/jcoap-core-1.1.2-sources.jar"/>
+	<classpathentry kind="lib" path="lib/log4j-api-2.6.2.jar" />
+	<classpathentry kind="lib" path="lib/log4j-core-2.6.2.jar" />
 	<classpathentry kind="output" path="bin"/>
 </classpath>