Switch assets manifest plugin

assets/build/util/assetsPluginProcessOutput.js

@@ -1,19 +0,0 @@
-
-const path = require('path');
-
-/**
- * Process AssetsPlugin output and format it
- * for Sage: {"[name].[ext]":"[name]_[hash].[ext]"}
- * @param  {Object} assets passed by processOutput
- * @return {String}        JSON
- */
-module.exports = (assets) => {
-  const manifest = {};
-  Object.keys(assets).forEach((name) => {
-    Object.keys(assets[name]).forEach((ext) => {
-      const filename = `${path.dirname(assets[name][ext])}/${path.basename(`${name}.${ext}`)}`;
-      manifest[filename] = assets[name][ext];
-    });
-  });
-  return manifest;
-};