Update build.xml

removed 
 <target name="phpcb"
         description="Aggregate tool output with PHP_CodeBrowser">
  <exec executable="phpcb">
   <arg value="--log" />
   <arg path="${basedir}/build/logs" />
   <arg value="--source" />
   <arg path="${basedir}/src" />
   <arg value="--output" />
   <arg path="${basedir}/build/code-browser" />
  </exec>
 </target>