add sass necessary package

Author: bbandydd

package.json

@@ -29,13 +29,15 @@
     "html-webpack-plugin": "^2.28.0",
     "less": "^2.7.1",
     "less-loader": "^2.2.3",
+    "node-sass": "^4.5.3",
     "null-loader": "^0.1.1",
     "postcss": "^5.0.21",
     "postcss-loader": "^1.3.3",
     "react": "^15.0.1",
     "react-dom": "^15.0.1",
     "react-hot-loader": "^3.0.0-beta.6",
     "react-router": "^3.0.2",
+    "sass-loader": "^6.0.6",
     "style-loader": "^0.13.1",
     "url-loader": "^0.5.7",
     "webpack": "^2.2.1",