Update node-sass to be able to use latest node

Author: Túlio Ornelas

package.json

@@ -14,12 +14,12 @@
     "fs-extra": "0.18.x",
     "mousetrap": "1.5.x",
     "node-libs-browser": "^1.0.0",
-    "node-sass": "^3.1.2",
+    "node-sass": "^4.5.3",
     "promise": "7.0.x",
-    "sass-loader": "1.0.x",
-    "style-loader": "0.12.x",
+    "sass-loader": "6.0.x",
+    "style-loader": "0.18.x",
     "sweetalert": "1.0.x",
-    "webpack": "1.12.x"
+    "webpack": "1.15.x"
   },
   "engines": {
     "node": "7.0",