Better URL validation (#1507)

* Add correct git branch name validation

* Change git refname validation error constant name

* Implement URL validation based on GoLang url.Parse method

* Backward compatibility with older Go compiler

* Add git reference name validation unit tests

* Remove unused variable in unit test

* Implement URL validation based on GoLang url.Parse method

* Backward compatibility with older Go compiler

* Add url validation unit tests

modules/auth/user_form.go

@@ -103,7 +103,7 @@ type UpdateProfileForm struct {
 	FullName         string `binding:"MaxSize(100)"`
 	Email            string `binding:"Required;Email;MaxSize(254)"`
 	KeepEmailPrivate bool
-	Website          string `binding:"Url;MaxSize(255)"`
+	Website          string `binding:"ValidUrl;MaxSize(255)"`
 	Location         string `binding:"MaxSize(50)"`
 }