Allow manual startup of the test server

Ruby 1.8.7 does not like running the test server inside a thread in the rspec
process itself. It causes a deadlock. Adding the script/test_server again for
those unfortunate ones still testing on 1.8.7

script/test_server

@@ -0,0 +1,30 @@
+#!/usr/bin/env ruby
+## -------------------------------------------------------------------
+##
+## Patron HTTP Client: HTTP test server for integration tests
+## Copyright (c) 2008 The Hive http://www.thehive.com/
+##
+## Permission is hereby granted, free of charge, to any person obtaining a copy
+## of this software and associated documentation files (the "Software"), to deal
+## in the Software without restriction, including without limitation the rights
+## to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+## copies of the Software, and to permit persons to whom the Software is
+## furnished to do so, subject to the following conditions:
+##
+## The above copyright notice and this permission notice shall be included in
+## all copies or substantial portions of the Software.
+##
+## THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+## IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+## FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+## AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+## LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+## OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+## THE SOFTWARE.
+##
+## -------------------------------------------------------------------
+
+root = File.expand_path('../..', __FILE__)
+require File.join(root, %w[spec support test_server.rb])
+
+PatronTestServer.start($stderr).join