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-rest-parameter/function-expression/expected.json

@@ -69,7 +69,8 @@
               "end": {
                 "line": 1,
                 "column": 1
-              }
+              },
+              "identifierName": "f"
             },
             "name": "f"
           },
@@ -90,6 +91,7 @@
             "id": null,
             "generator": false,
             "expression": false,
+            "async": false,
             "params": [
               {
                 "type": "Identifier",
@@ -103,7 +105,8 @@
                   "end": {
                     "line": 1,
                     "column": 14
-                  }
+                  },
+                  "identifierName": "a"
                 },
                 "name": "a"
               },
@@ -133,7 +136,8 @@
                     "end": {
                       "line": 1,
                       "column": 20
-                    }
+                    },
+                    "identifierName": "b"
                   },
                   "name": "b"
                 }
@@ -153,11 +157,13 @@
                   "column": 24
                 }
               },
-              "body": []
+              "body": [],
+              "directives": []
             }
           }
         }
       }
-    ]
+    ],
+    "directives": []
   }
 }