Fix library loading for BackendController and its spec.

ActionWebService::Protocol::Discovery uses write_inheritable_array to
register protocols. Due to the order of library loading, during testing
only, the ApplicationController class would be created before
ActionWebService::Protocol::XmlRpc was registered in
ActionController::Base. This meant BackendController needed to include
ActionWebService::Protocol::XmlRpc again in the specs to register it.

By requiring 'action_web_service' in environment.rb with the other included
libraries, we make sure it is loaded early enough to avoid this.

Also, some other unneccesary require statements were removed from the spec.

app/controllers/backend_controller.rb

@@ -1,6 +1,5 @@
 class BackendController < ContentController
   skip_before_filter :verify_authenticity_token
-  require 'actionwebservice'
   cache_sweeper :blog_sweeper
 
   web_service_dispatching_mode :layered

config/environment.rb

@@ -55,6 +55,7 @@
 # Load included libraries.
 #require 'uuidtools'
 
+require 'action_web_service'
 require 'migrator'
 require 'rails_patch/active_record'
 require 'rails_patch/active_support'

spec/controllers/backend_controller_spec.rb

@@ -1,18 +1,8 @@
-require File.dirname(__FILE__) + '/../spec_helper'
+require 'spec_helper'
 require 'action_web_service/test_invoke'
-require 'backend_controller'
-require 'blogger_service'
-require 'meta_weblog_service'
-require 'app/apis/movable_type_service.rb'
-require 'digest/sha1'
-require 'base64'
 
 User.salt = 'change-me'
 
-BackendController.class_eval do
-  include ActionWebService::Protocol::XmlRpc
-end
-
 describe BackendController do
   before do
     @protocol = :xmlrpc