fix ids in older drafts

Author: karenetheridge

tests/draft3/ref.json

@@ -201,24 +201,24 @@
         ]
     },
     {
-        "description": "$ref prevents a sibling $id from changing the base uri",
+        "description": "$ref prevents a sibling id from changing the base uri",
         "schema": {
-            "$id": "http://localhost:1234/sibling_id/base/",
+            "id": "http://localhost:1234/sibling_id/base/",
             "definitions": {
                 "foo": {
-                    "$id": "http://localhost:1234/sibling_id/foo.json",
+                    "id": "http://localhost:1234/sibling_id/foo.json",
                     "minimum": 2
                 },
                 "base_foo": {
                     "$comment": "this canonical uri is http://localhost:1234/sibling_id/base/foo.json",
-                    "$id": "foo.json",
+                    "id": "foo.json",
                     "minimum": 5
                 }
             },
             "allOf": [
                 {
                     "$comment": "$ref resolves to http://localhost:1234/sibling_id/base/foo.json, not ttp://localhost:1234/sibling_id/foo.json",
-                    "$id": "http://localhost:1234/sibling_id/",
+                    "id": "http://localhost:1234/sibling_id/",
                     "$ref": "foo.json"
                 }
             ]

tests/draft4/ref.json

@@ -176,24 +176,24 @@
         ]
     },
     {
-        "description": "$ref prevents a sibling $id from changing the base uri",
+        "description": "$ref prevents a sibling id from changing the base uri",
         "schema": {
-            "$id": "http://localhost:1234/sibling_id/base/",
+            "id": "http://localhost:1234/sibling_id/base/",
             "definitions": {
                 "foo": {
-                    "$id": "http://localhost:1234/sibling_id/foo.json",
+                    "id": "http://localhost:1234/sibling_id/foo.json",
                     "minimum": 2
                 },
                 "base_foo": {
                     "$comment": "this canonical uri is http://localhost:1234/sibling_id/base/foo.json",
-                    "$id": "foo.json",
+                    "id": "foo.json",
                     "minimum": 5
                 }
             },
             "allOf": [
                 {
                     "$comment": "$ref resolves to http://localhost:1234/sibling_id/base/foo.json, not ttp://localhost:1234/sibling_id/foo.json",
-                    "$id": "http://localhost:1234/sibling_id/",
+                    "id": "http://localhost:1234/sibling_id/",
                     "$ref": "foo.json"
                 }
             ]