fix the Globals middleware

- add to the autoload configuration
- fix issues with it accessing an undefined var/method

lib/grape.rb

@@ -104,6 +104,7 @@ module Middleware
     autoload :Versioner
     autoload :Formatter
     autoload :Error
+    autoload :Globals
 
     module Auth
       extend ActiveSupport::Autoload

lib/grape/middleware/globals.rb

@@ -4,7 +4,8 @@ module Grape
   module Middleware
     class Globals < Base
       def before
-        @env['grape.request'] = Grape::Request.new(@env)
+        request = Grape::Request.new(@env)
+        @env['grape.request'] = request
         @env['grape.request.headers'] = request.headers
         @env['grape.request.params'] = request.params if @env['rack.input']
       end