Upgrade build tools

Author: marijnh

package.json

@@ -18,9 +18,9 @@
     "blint": "^0.5.1",
     "node-static": "0.6.0",
     "phantomjs-prebuilt": "^2.1.12",
-    "rollup": "^0.34.10",
+    "rollup": "^0.41.0",
     "rollup-plugin-buble": "^0.15.0",
-    "rollup-watch": "^2.5.0"
+    "rollup-watch": "^3.2.0"
   },
   "bugs": "http://github.com/codemirror/CodeMirror/issues",
   "keywords": [