Fix npm install fail

Fail due to some NPM package not found

Author: teakoder

package.json

@@ -50,7 +50,8 @@
     "react-router": "^2.4.1",
     "redux": "^3.5.2",
     "redux-thunk": "^2.1.0",
-    "sanitize-html": "^1.11.4"
+    "sanitize-html": "^1.11.4",
+    "es-abstract": "1.14.1"
   },
   "devDependencies": {
     "ava": "^0.15.2",