added slf4j logger

.classpath

@@ -10,5 +10,7 @@
 		</attributes>
 	</classpathentry>
 	<classpathentry combineaccessrules="false" kind="src" path="/common-monitoring"/>
+	<classpathentry kind="lib" path="lib/slf4j-api-1.7.5.jar"/>
+	<classpathentry kind="lib" path="lib/slf4j-simple-1.7.5.jar"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>

build.xml

@@ -32,6 +32,8 @@
 			<fileset dir="lib" includes="*LICENSE*" />
 			<zipfileset excludes="META-INF/*.SF" src="lib/disruptor-3.2.0.jar"/>
 			<zipfileset excludes="META-INF/*.SF" src="${build.dir}/explorviz-common.jar"/>
+			<zipfileset excludes="META-INF/*.SF" src="lib/slf4j-api-1.7.5.jar"/>
+			<zipfileset excludes="META-INF/*.SF" src="lib/slf4j-simple-1.7.5.jar"/>
 		</jar>
 		<mkdir dir="${jar.dir}/META-INF"/>
 		<copy todir="${jar.dir}/META-INF">