message: revert post css loader version
diff: "material-design-lite": "1.3.0",
  "ncp": "2.0.0",
  "node-sass": "4.5.3",
  - "postcss-loader": "2.0.5",
  + "postcss-loader": "1.3.3",
  "protractor": "5.1.2",
  "raw-loader": "0.5.1",
  "rimraf": "2.6.1",
  