Minor fixes because of PHP7 strict mode

Author: kukulich

src/PhpGenerator/ClassType.php

@@ -101,7 +101,7 @@ public static function from($from)
 
 	public function __construct($name = NULL, PhpNamespace $namespace = NULL)
 	{
-		$this->setName($name);
+		$this->setName((string) $name);
 		$this->namespace = $namespace;
 	}
 

src/PhpGenerator/Method.php

@@ -285,7 +285,7 @@ public function setVisibility($val)
 
 
 	/**
-	 * @return string
+	 * @return string|NULL
 	 */
 	public function getVisibility()
 	{

src/PhpGenerator/Parameter.php

@@ -60,7 +60,7 @@ public static function from(\ReflectionParameter $from)
 
 		$namespace = $from->getDeclaringClass() ? $from->getDeclaringClass()->getNamespaceName() : NULL;
 		$namespace = $namespace ? "\\$namespace\\" : '\\';
-		if (Nette\Utils\Strings::startsWith($param->typeHint, $namespace)) {
+		if ($param->typeHint !== NULL && Nette\Utils\Strings::startsWith($param->typeHint, $namespace)) {
 			$param->typeHint = substr($param->typeHint, strlen($namespace));
 		}
 		return $param;

src/PhpGenerator/PhpNamespace.php

@@ -37,7 +37,7 @@ class PhpNamespace extends Object
 
 	public function __construct($name = NULL)
 	{
-		$this->setName($name);
+		$this->setName((string) $name);
 	}