Use active_support/mini since we just need inflections.

activesupport/lib/active_support/mini.rb

@@ -1,9 +1,9 @@
 $LOAD_PATH.unshift File.dirname(__FILE__)
 
-require "core_ext/blank"
 # whole object.rb pulls up rarely used introspection extensions
+require "core_ext/object/blank"
 require "core_ext/object/metaclass"
 require 'core_ext/array'
 require 'core_ext/hash'
 require 'core_ext/module/attribute_accessors'
-require 'core_ext/string/inflections'
+require 'core_ext/string/inflections'

railties/lib/generators.rb

@@ -2,11 +2,11 @@
 $:.unshift(activesupport_path) if File.directory?(activesupport_path)
 
 begin
-  require 'active_support/all'
+  require 'active_support/mini'
 rescue LoadError
   require 'rubygems'
   gem 'activesupport'
-  require 'active_support/all'
+  require 'active_support/mini'
 end
 
 $:.unshift(File.dirname(__FILE__))