Upgrade js-yaml to avoid Denial of Service

Author: Teamop

package.json

@@ -17,7 +17,7 @@
         "watch": "jbuild watch"
     },
     "dependencies": {
-        "js-yaml": "3.11.x",
+        "js-yaml": "3.13.x",
         "ports": "1.1.x",
         "underscore": "1.9.x"
     },