message: update extract-text to fix npm error
diff: "eslint": "^3.12.2",
  "exports-loader": "^0.6.3",
  "extract-loader": "^0.1.0",
  - "extract-text-webpack-plugin": "github:webpack/extract-text-webpack-plugin",
  + "extract-text-webpack-plugin": "^2.0.0",
  "grunt": "^1.0.1",
  "grunt-cli": "^1.2.0",
  "grunt-contrib-compress": "^1.3.0",
  