Add slf4j and modify build scripts to bundle it

Change-Id: I39690644e4382843118d4c0321a55dfc45e7a917
Reviewed-on: http://gerrit.dmdirc.com/2312
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

build.xml

@@ -30,9 +30,15 @@
         <delete dir="modules/util/dist"/>
     </target>
 
+    <target name="-bundle-slf4j">
+        <jar destfile="${dist.jar}" update="true">
+            <zipfileset src="lib/slf4j-api-1.6.4.jar" includes="org/slf4j/**/*"/>
+        </jar>
+    </target>
+
     <target name="-pre-init" depends="-init-private-properties"/>
     <target name="-post-compile" depends="-write-version, build-plugins"/>
     <target name="-post-test-run" depends="-do-test-reports"/>
-    <target name="-post-jar" depends="-update-bundled-plugins"/>
+    <target name="-post-jar" depends="-update-bundled-plugins,-bundle-slf4j"/>
 
 </project>