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/switch-no-default-comment-in-function/expected.json

@@ -54,12 +54,14 @@
             "end": {
               "line": 1,
               "column": 12
-            }
+            },
+            "identifierName": "bar"
           },
           "name": "bar"
         },
         "generator": false,
         "expression": false,
+        "async": false,
         "params": [
           {
             "type": "Identifier",
@@ -73,7 +75,8 @@
               "end": {
                 "line": 1,
                 "column": 14
-              }
+              },
+              "identifierName": "a"
             },
             "name": "a"
           }
@@ -119,7 +122,8 @@
                   "end": {
                     "line": 2,
                     "column": 13
-                  }
+                  },
+                  "identifierName": "a"
                 },
                 "name": "a"
               },