correctly handle zooinspector resources

zooinspector will start up with blank window when directly use IDE to run ZooInspector#main.

this is caused by icos resource load failed, by default icos are loaded from /usr/local/share and /usr/local/share and fail back to classpath.

because of parent pom config, resources are excluded and directory is not default, so resource directory icos are not copyed to target/class.