Merge pull request #5891 from kennyj/remove_time_directory

Remove dead code: active_support/time/autoload.rb was moved to active_support/time.rb

activesupport/lib/active_support/time/autoload.rb

-module ActiveSupport
-  autoload :Duration, 'active_support/duration'
-  autoload :TimeWithZone, 'active_support/time_with_zone'
-  autoload :TimeZone, 'active_support/values/time_zone'
-end