Catch an IOError that happens on Ruby 2.0

Would get a #<IOError: closed stream> error on Ruby 2.0

lib/rack/livereload/body_processor.rb

@@ -45,7 +45,7 @@ module Rack
           begin
             http.send_request('GET', uri.path)
             @use_vendored = false
-          rescue ::Timeout::Error, Errno::ECONNREFUSED, EOFError
+          rescue ::Timeout::Error, Errno::ECONNREFUSED, EOFError, IOError
             @use_vendored = true
           rescue => e
             $stderr.puts e.inspect