Adding ga.js to cdn bundle

tasks/cdn.js

@@ -31,7 +31,7 @@ gulp.task('cdn:stage-bower_components', function() {
 });
 
 gulp.task('cdn:stage-vaadin-components', function() {
-  return gulp.src(['README.md', 'LICENSE.html', 'vaadin-components.html', 'demo/*', 'apidoc/*'], {base:"."})
+  return gulp.src(['README.md', 'LICENSE.html', 'ga.js', 'vaadin-components.html', 'demo/*', 'apidoc/*'], {base:"."})
     .pipe(replace('https://cdn.vaadin.com/vaadin-components/latest/', '../../'))
     .pipe(gulp.dest(stagingPath + "/vaadin-components"));
 });