Description: Fix random tests failures

Origin: upstream, https://github.com/rubyzip/rubyzip/commit/96f84aee4c575a0c886462abb809ef47e2866f94
Last-Update: 2014-09-23

Index: ruby-zip/test/central_directory_test.rb
===================================================================
--- ruby-zip.orig/test/central_directory_test.rb
+++ ruby-zip/test/central_directory_test.rb
@@ -6,6 +6,10 @@ class ZipCentralDirectoryTest < MiniTest
     ::Zip.reset!
   end
 
+  def teardown
+    ::Zip.reset!
+  end
+
   def test_read_from_stream
     ::File.open(TestZipFile::TEST_ZIP2.zip_name, "rb") {
         |zipFile|
