Add `.` to the list of allowed characters.

This was missed when the email validation rules were relaxed in
dc34d80f6f622e883b8c7db9ef489bd514c8701f.

Fixes #4027

lib/Cake/Network/Email/CakeEmail.php

@@ -320,7 +320,7 @@ class CakeEmail {
  *
  * @var string
  */
-	protected $_emailPattern = '/^((?:[\p{L}0-9!#$%&\'*+\/=?^_`{|}~-]+)*@[\p{L}0-9-.]+)$/ui';
+	protected $_emailPattern = '/^((?:[\p{L}0-9.!#$%&\'*+\/=?^_`{|}~-]+)*@[\p{L}0-9-.]+)$/ui';
 
 /**
  * The class name used for email configuration.

lib/Cake/Test/Case/Network/Email/CakeEmailTest.php

@@ -251,7 +251,7 @@ class CakeEmailTest extends CakeTestCase {
 		$list = array(
 			'root@localhost' => 'root',
 			'bjørn@hammeröath.com' => 'Bjorn',
-			'cake@cakephp.org' => 'Cake PHP',
+			'cake.php@cakephp.org' => 'Cake PHP',
 			'cake-php@googlegroups.com' => 'Cake Groups',
 			'root@cakephp.org'
 		);
@@ -259,7 +259,7 @@ class CakeEmailTest extends CakeTestCase {
 		$expected = array(
 			'root@localhost' => 'root',
 			'bjørn@hammeröath.com' => 'Bjorn',
-			'cake@cakephp.org' => 'Cake PHP',
+			'cake.php@cakephp.org' => 'Cake PHP',
 			'cake-php@googlegroups.com' => 'Cake Groups',
 			'root@cakephp.org' => 'root@cakephp.org'
 		);
@@ -271,7 +271,7 @@ class CakeEmailTest extends CakeTestCase {
 		$expected = array(
 			'root@localhost' => 'root',
 			'bjørn@hammeröath.com' => 'Bjorn',
-			'cake@cakephp.org' => 'Cake PHP',
+			'cake.php@cakephp.org' => 'Cake PHP',
 			'cake-php@googlegroups.com' => 'Cake Groups',
 			'root@cakephp.org' => 'root@cakephp.org',
 			'jrbasso@cakephp.org' => 'jrbasso@cakephp.org',