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/surrounding-while-loop-comments/expected.json

@@ -54,12 +54,14 @@
             "end": {
               "line": 1,
               "column": 10
-            }
+            },
+            "identifierName": "f"
           },
           "name": "f"
         },
         "generator": false,
         "expression": false,
+        "async": false,
         "params": [],
         "body": {
           "type": "BlockStatement",
@@ -204,7 +206,8 @@
                       "end": {
                         "line": 1,
                         "column": 65
-                      }
+                      },
+                      "identifierName": "each"
                     },
                     "name": "each",
                     "leadingComments": null