Test runner: Detect extra property in 'actual' but not in 'expected'. (#407)

* Test runner: Detect extra property in 'actual' but not in 'expected'.

Also update all expected.json where this would result in errors.

* Include rmExpected.js script in case it is needed again

test/fixtures/esprima/es2015-array-pattern/empty-pattern-catch-param/expected.json

@@ -56,7 +56,8 @@
               "column": 7
             }
           },
-          "body": []
+          "body": [],
+          "directives": []
         },
         "handler": {
           "type": "CatchClause",
@@ -102,12 +103,14 @@
                 "column": 21
               }
             },
-            "body": []
+            "body": [],
+            "directives": []
           }
         },
         "guardedHandlers": [],
         "finalizer": null
       }
-    ]
+    ],
+    "directives": []
   }
 }