Remove SocketDebugger and deprecate socket_class

Because:

* SocketDebugger is less useful than debug logging in the driver
* SocketDebugger has been broken for several releases and is unused
* The socket_class option was only used for injecting SocketDebugger

This commit:

* Removes the SocketDebugger class
* Deprecates the socket_class option

lib/capybara/webkit/connection.rb

@@ -12,7 +12,13 @@ module Capybara::Webkit
 
     def initialize(options = {})
       @socket = nil
-      @socket_class = options[:socket_class] || TCPSocket
+      if options.has_key?(:socket_class)
+        warn '[DEPRECATION] The Capybara::Webkit::Connection `socket_class` ' \
+          'option is deprecated without replacement.'
+        @socket_class = options[:socket_class]
+      else
+        @socket_class = TCPSocket
+      end
       if options.has_key?(:stderr)
         @output_target = options[:stderr]
       elsif options.has_key?(:stdout)

lib/capybara/webkit/driver.rb

@@ -3,7 +3,6 @@ require "capybara/webkit/version"
 require "capybara/webkit/node"
 require "capybara/webkit/connection"
 require "capybara/webkit/browser"
-require "capybara/webkit/socket_debugger"
 require "capybara/webkit/cookie_jar"
 require "capybara/webkit/errors"
 

lib/capybara/webkit/socket_debugger.rb

@@ -1,46 +0,0 @@
-# Wraps the TCP socket and prints data sent and received. Used for debugging
-# the wire protocol. You can use this by passing a :socket_class to Browser.
-module Capybara::Webkit
-  class SocketDebugger
-    def self.open(host, port)
-      real_socket = TCPSocket.open(host, port)
-      new(real_socket)
-    end
-
-    def initialize(socket)
-      @socket = socket
-    end
-
-    def read(length)
-      received @socket.read(length)
-    end
-
-    def puts(line)
-      sent line
-      @socket.puts(line)
-    end
-
-    def print(content)
-      sent content
-      @socket.print(content)
-    end
-
-    def gets
-      received @socket.gets
-    end
-
-    def setsockopt(level, name, value)
-    end
-
-    private
-
-    def sent(content)
-      Kernel.puts " >> " + content.to_s
-    end
-
-    def received(content)
-      Kernel.puts " << " + content.to_s
-      content
-    end
-  end
-end

spec/spec_helper.rb

@@ -10,7 +10,7 @@ $LOAD_PATH << File.join(PROJECT_ROOT, 'lib')
 Dir[File.join(PROJECT_ROOT, 'spec', 'support', '**', '*.rb')].each { |file| require(file) }
 
 require 'capybara/webkit'
-$webkit_connection = Capybara::Webkit::Connection.new(:socket_class => TCPSocket)
+$webkit_connection = Capybara::Webkit::Connection.new
 $webkit_browser = Capybara::Webkit::Browser.new($webkit_connection)
 
 if ENV['DEBUG']