Fixed the filename for uploaded files

This is a backport of #160 for the 1.0.x branch

Author: stof

Goutte/Client.php

@@ -165,7 +165,7 @@ protected function addPostFiles($request, array $files, $arrayName = '')
             if (is_array($info)) {
                 if (isset($info['tmp_name'])) {
                     if ('' !== $info['tmp_name']) {
-                        $request->addPostFile($name, $info['tmp_name']);
+                        $request->addPostFile($name, $info['tmp_name'], null, isset($info['name']) ? $info['name'] : null);
                     } else {
                         continue;
                     }

Goutte/Tests/ClientTest.php

@@ -131,7 +131,7 @@ public function testUsesPostFiles()
 
         $this->assertEquals(array(
             'test' => array(
-                new PostFile('test', __FILE__, 'text/x-php')
+                new PostFile('test', __FILE__, 'text/x-php', 'test.txt')
             )
         ), $request->getPostFiles());
     }
@@ -174,7 +174,7 @@ public function testUsesPostFilesNestedFields()
 
         $this->assertEquals(array(
             'form[test]' => array(
-                new PostFile('form[test]', __FILE__, 'text/x-php')
+                new PostFile('form[test]', __FILE__, 'text/x-php', 'test.txt')
             )
         ), $request->getPostFiles());
     }