Forward stderr from server to stderr, drop stdout

We don't actually write anything to stdout. Also rename the stdout
option to stderr, since that's where we forward the output.

lib/capybara/webkit/connection.rb

@@ -12,7 +12,7 @@ module Capybara::Webkit
 
     def initialize(options = {})
       @socket_class = options[:socket_class] || TCPSocket
-      @output_target = options.has_key?(:stdout) ? options[:stdout] : $stdout
+      @output_target = options.has_key?(:stderr) ? options[:stderr] : $stderr
       start_server
       connect
     end
@@ -73,10 +73,6 @@ module Capybara::Webkit
     end
 
     def forward_output_in_background_thread
-      Thread.new do
-        Thread.current.abort_on_exception = true
-        IO.copy_stream(@pipe_stdout, @output_target)
-      end
       Thread.new do
         Thread.current.abort_on_exception = true
         IO.copy_stream(@pipe_stderr, @output_target)

spec/connection_spec.rb

@@ -18,9 +18,9 @@ describe Capybara::Webkit::Connection do
     response.should include("Hey there")
   end
 
-  it 'forwards stdout to the given IO object' do
+  it 'forwards stderr to the given IO object' do
     io = StringIO.new
-    redirected_connection = Capybara::Webkit::Connection.new(:stdout => io)
+    redirected_connection = Capybara::Webkit::Connection.new(:stderr => io)
     script = 'console.log("hello world")'
     redirected_connection.puts "EnableLogging"
     redirected_connection.puts 0
@@ -29,7 +29,7 @@ describe Capybara::Webkit::Connection do
     redirected_connection.puts script.to_s.bytesize
     redirected_connection.print script
     sleep(0.5)
-    io.string.should include "hello world \n"
+    io.string.should =~ /hello world $/
   end
 
   it "returns the server port" do

spec/driver_spec.rb

@@ -2092,7 +2092,7 @@ describe Capybara::Webkit::Driver do
     end
 
     let(:driver) do
-      connection = Capybara::Webkit::Connection.new(:stdout => output)
+      connection = Capybara::Webkit::Connection.new(:stderr => output)
       browser = Capybara::Webkit::Browser.new(connection)
       Capybara::Webkit::Driver.new(AppRunner.app, :browser => browser)
     end