code: protected OutputStream createOutputStream (File target)
          throws IOException
      {
          // make sure the parent directory exists
          target.getParentFile().mkdirs();
          // now create our file
          JarOutputStream jout = new JarOutputStream(new FileOutputStream(target));
          jout.setLevel(uncompressed() ? Deflater.NO_COMPRESSION : Deflater.BEST_COMPRESSION);
          return jout;
      }
docs: Creates the base output stream to which to write our bundle's files.