removes temporary LRU hack now provided by the gem

Author: fxn

activesupport/activesupport.gemspec

@@ -25,5 +25,5 @@ Gem::Specification.new do |s|
   s.add_dependency 'tzinfo',     '~> 0.3.37'
   s.add_dependency 'minitest',   '~> 4.2'
   s.add_dependency 'thread_safe','~> 0.1'
-  s.add_dependency 'lru_redux'
+  s.add_dependency 'lru_redux',  '~> 0.0.6'
 end

activesupport/lib/active_support/inflector/memoization.rb

@@ -2,13 +2,6 @@
 
 require 'lru_redux'
 
-LruRedux::Cache.class_eval do
-  def fetch(key)
-    self[key] = yield unless @data.key?(key)
-    self[key]
-  end
-end
-
 module ActiveSupport
   module Inflector
     LRU_CACHE_SIZE = 200
@@ -26,7 +19,7 @@ def self.memoize(method_name)
 
       # Note that so far no method in the inflector gets a block.
       define_method(method_name) do |*args|
-        cache.fetch(args) do
+        cache.getset(args) do
           send("#{method_name}_without_lru_cache", *args)
         end
       end