move HTML normalization into the parser itself

these serializing rules are actually specified by the microformats
parsing spec, so they do belong in the parser, not just in the tests.

microformats.go

@@ -357,6 +357,12 @@ func (p *parser) walk(node *html.Node) {
 					html.Render(&buf, c)
 				}
 				htmlbody = strings.TrimSpace(buf.String())
+
+				// HTML spec: Serializing HTML Fragments algorithm does not include
+				// a trailing slash, so remove it.  Nor should apostrophes be
+				// encoded, which golang.org/x/net/html is doing.
+				htmlbody = strings.Replace(htmlbody, `/>`, `>`, -1)
+				htmlbody = strings.Replace(htmlbody, `'`, `'`, -1)
 			case "dt":
 				if value == nil {
 					value = getDateTimeValue(node)

testsuite_test.go

@@ -124,8 +124,6 @@ func runTest(t *testing.T, test string) {
 	if err != nil {
 		t.Fatalf("error reading file %q: %v", test+".json", err)
 	}
-	// normalize self-closing HTML tags to match what net/html produces
-	expectedJSON = bytes.Replace(expectedJSON, []byte(" />"), []byte("/>"), -1)
 
 	want := make(map[string]interface{})
 	err = json.Unmarshal(expectedJSON, &want)
@@ -134,9 +132,6 @@ func runTest(t *testing.T, test string) {
 	}
 
 	outputJSON, _ := json.Marshal(data)
-	// reverse golang.org/x/net/http's escaping of apostrophes
-	outputJSON = bytes.Replace(outputJSON, []byte(`\u0026#39;`), []byte("'"), -1)
-
 	got := make(map[string]interface{})
 	err = json.Unmarshal(outputJSON, &got)
 	if err != nil {