fixes in type casts

Author: dg

src/PhpGenerator/ClassType.php

@@ -103,7 +103,7 @@ public static function from($from)
 
 	public function __construct($name = NULL, PhpNamespace $namespace = NULL)
 	{
-		$this->name = $name;
+		$this->setName($name);
 		$this->namespace = $namespace;
 	}
 

src/PhpGenerator/Helpers.php

@@ -215,7 +215,7 @@ public static function createObject($class, array $props)
 	 */
 	public static function extractNamespace($name)
 	{
-		return ($pos = strrpos($name, '\\')) ? substr($name, 0, $pos) : NULL;
+		return ($pos = strrpos($name, '\\')) ? substr($name, 0, $pos) : '';
 	}
 
 

src/PhpGenerator/PhpNamespace.php

@@ -39,7 +39,7 @@ class PhpNamespace extends Object
 
 	public function __construct($name = NULL)
 	{
-		$this->name = $name;
+		$this->setName($name);
 	}
 
 
@@ -58,7 +58,7 @@ public function getName()
 	 */
 	public function setName($name)
 	{
-		$this->name = $name;
+		$this->name = (string) $name;
 		return $this;
 	}