correctly remove temporary files when uncompressing ZIPs

src/Zip.php

@@ -223,6 +223,7 @@ class Zip extends Archive
                 }
                 fclose($fp);
                 gzclose($gzp);
+                unlink($extractto); // remove temporary gz file
             }
 
             touch($output, $fileinfo->getMtime());

tests/zip.test.php

@@ -140,6 +140,10 @@ class Zip_TestCase extends PHPUnit_Framework_TestCase
         $this->assertFileExists($out.'/zip/foobar/testdata2.txt', "Extracted $file");
         $this->assertEquals(13, filesize($out.'/zip/foobar/testdata2.txt'), "Extracted $file");
 
+        $this->assertFileExists($out.'/zip/compressable.txt', "Extracted $file");
+        $this->assertEquals(1836, filesize($out.'/zip/compressable.txt'), "Extracted $file");
+        $this->assertFileNotExists($out.'/zip/compressable.txt.gz', "Extracted $file");
+
         self::rdelete($out);
     }