Merge pull request #1334 from mozilla/greenkeeper-node-sass-3.11.1

Update node-sass to version 3.11.1 🚀

package.json

@@ -230,7 +230,7 @@
     "karma-sourcemap-loader": "0.3.7",
     "karma-webpack": "1.8.0",
     "mocha": "3.1.2",
-    "node-sass": "3.10.1",
+    "node-sass": "3.11.1",
     "po2json": "0.4.5",
     "postcss-loader": "1.1.0",
     "react-addons-test-utils": "15.3.2",