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/comments/basic/export-default-anonymous-class/expected.json

@@ -87,6 +87,7 @@
                     "column": 5
                   }
                 },
+                "static": false,
                 "computed": false,
                 "key": {
                   "type": "Identifier",
@@ -100,16 +101,17 @@
                     "end": {
                       "line": 8,
                       "column": 11
-                    }
+                    },
+                    "identifierName": "method1"
                   },
                   "name": "method1",
                   "leadingComments": null
                 },
-                "static": false,
                 "kind": "method",
                 "id": null,
                 "generator": false,
                 "expression": false,
+                "async": false,
                 "params": [],
                 "body": {
                   "type": "BlockStatement",