Unforce memcache from AS

Signed-off-by: José Valim <jose.valim@gmail.com>

Gemfile

@@ -21,6 +21,9 @@ elsif RUBY_ENGINE == "jruby"
   gem "jruby-openssl"
 end
 
+# AS
+gem "memcache-client", ">= 1.7.5"
+
 # AR
 if mri || RUBY_ENGINE == "rbx"
   gem "sqlite3-ruby", "= 1.3.0.beta.2", :require => 'sqlite3'

activesupport/activesupport.gemspec

@@ -18,6 +18,4 @@ Gem::Specification.new do |s|
   s.require_path = 'lib'
 
   s.has_rdoc = true
-
-  s.add_dependency('memcache-client', '>= 1.7.5')
 end

activesupport/lib/active_support/cache/mem_cache_store.rb

@@ -1,4 +1,9 @@
-require 'memcache'
+begin
+  require 'memcache'
+rescue LoadError => e
+  $stderr.puts "You don't have memcache installed in your application. Please add it to your Gemfile and run bundle install"
+  raise e
+end
 require 'digest/md5'
 
 module ActiveSupport