Add yarn.lock

.gitignore

@@ -1,5 +1,4 @@
 .DS_Store
 *.log
 node_modules
-yarn.lock
 /themes

package.json

@@ -35,9 +35,9 @@
     "nodemon": "^1.11.0",
     "postcss": "^5.2.6",
     "postcss-salad": "^1.0.5",
-    "rollup": "^0.36.3",
+    "rollup": "^0.41.1",
-    "rollup-plugin-buble": "^0.14.0",
+    "rollup-plugin-buble": "^0.15.0",
-    "rollup-plugin-commonjs": "^5.0.5",
+    "rollup-plugin-commonjs": "^7.0.0",
     "rollup-plugin-node-resolve": "^2.0.0",
     "rollup-plugin-uglify": "^1.0.1",
     "serve-static": "^1.11.1"