2.0 RC 1 - new ConfigurationService (#3810)

* use html5 email validation
* remove static cache seed, for compatibility with non default (file based) caches
* added caching ConfigurationService, removed use of doctrine result cache
* simplify configuration API

src/Form/Type/MailType.php

@@ -21,7 +21,7 @@ final class MailType extends AbstractType
         $resolver->setDefaults([
             'label' => 'email',
             'constraints' => [
-                new Email(['mode' => 'loose'])
+                new Email(['mode' => 'html5'])
             ],
         ]);
     }