BETA/COMMUNITY/LIBS: Some minor updates/fixes.

 * Minor Update for Builders javac task to prevent Ant from creating empty dummy classes.
 * Updated Eclipse settings (same that core) for Libs Projects and Community Server.
 * Removed -switchDefault from warn settings in ECJ due is already ignored by default.

L2J_Server_BETA/build.xml

@@ -61,7 +61,7 @@
 	</target>
 
 	<target name="compile" depends="dist" description="Compile the source.">
-		<javac srcdir="${src}" classpathref="classpath" destdir="${build.bin}" compiler="javac1.7" debug="true" debuglevel="lines,vars,source" includeantruntime="false" source="1.7" target="1.7" />
+		<javac srcdir="${src}" classpathref="classpath" destdir="${build.bin}" compiler="javac1.7" createMissingPackageInfoClass="false" debug="true" debuglevel="lines,vars,source" includeantruntime="false" source="1.7" target="1.7" />
 	</target>
 
 	<target name="jar" depends="compile" description="Create the jar files.">