public static void unzip(File zippedFile, String charsetName) {
		unzip(zippedFile, zippedFile.getParentFile(), charsetName);
	}
Unzip the given zipped file with given character set.

@param zippedFile  zipped file
@param charsetName character set
ngrinder-core/src/main/java/org/ngrinder/common/util/CompressionUtils.java