function copyAssetsFor(demo, enc, next){
    const demoID = component + "/" + path.basename(demo.path);
    const demoDir = demo.path + "/**/*";

    const notJS  = '!' + demoDir + '.js';
    const notCSS = '!' + demoDir + '.css';
    const notHTML= '!' + demoDir + '.html';

    gulp.src([demoDir, notJS, notCSS, notHTML])
        .pipe(gulp.dest(distDir + demoID));

    next();
  }
Copy all the demo assets to the dist directory
NOTE: this excludes the modules demo .js,.css, .html files