Update ParserForm for new form tag style

@@ -190,10 +190,15 @@ func ParseForm(form url.Values, obj interface{}) error {
 			continue
 		}
 		fieldT := objT.Field(i)
-		tag := fieldT.Tag.Get("form")
-		if len(tag) == 0 {
+
+		tags := strings.Split(fieldT.Tag.Get("form"), ",")
+		var tag string
+		if len(tags) == 0 || len(tags[0]) == 0 {
 			tag = fieldT.Name
+		} else {
+			tag = tags[0]
 		}
+
 		value := form.Get(tag)
 		if len(value) == 0 {
 			continue

@@ -106,8 +106,9 @@ func TestParseForm(t *testing.T) {
 		Id    int
 		tag   string      `form:tag`
 		Name  interface{} `form:"username"`
-		Age   int         `form:"age"`
+		Age   int         `form:"age,text"`
 		Email string
+		Intro string `form:",textarea"`
 	}
 
 	u := user{}
@@ -116,6 +117,7 @@ func TestParseForm(t *testing.T) {
 		"username": []string{"test"},
 		"age":      []string{"40"},
 		"Email":    []string{"test@gmail.com"},
+		"Intro":    []string{"I am an engineer!"},
 	}
 	if err := ParseForm(form, u); err == nil {
 		t.Fatal("nothing will be changed")
@@ -127,15 +129,18 @@ func TestParseForm(t *testing.T) {
 		t.Errorf("Id should equal 0 but got %v", u.Id)
 	}
 	if len(u.tag) != 0 {
-		t.Error("tag's length should equal 0 but got %v", len(u.tag))
+		t.Errorf("tag's length should equal 0 but got %v", len(u.tag))
 	}
 	if u.Name.(string) != "test" {
-		t.Error("Name should equal `test` but got `%v`", u.Name.(string))
+		t.Errorf("Name should equal `test` but got `%v`", u.Name.(string))
 	}
 	if u.Age != 40 {
-		t.Error("Age should equal 40 but got %v", u.Age)
+		t.Errorf("Age should equal 40 but got %v", u.Age)
 	}
 	if u.Email != "test@gmail.com" {
-		t.Error("Email should equal `test@gmail.com` but got `%v`", u.Email)
+		t.Errorf("Email should equal `test@gmail.com` but got `%v`", u.Email)
+	}
+	if u.Intro != "I am an engineer!" {
+		t.Errorf("Intro should equal `I am an engineer!` but got `%v`", u.Intro)
 	}
 }