fix missing dependency when running require paperclip in irb

[istana]

fix missing dependency on delegator in Rails. Not sure how to test it, because all active support core extensions are loaded in spec_helper

2.3.1 :003 > require 'paperclip'
NoMethodError: undefined method `delegate' for Paperclip::UrlGenerator:Class
Did you mean?  DelegateClass
  from /Users/lordvacuumcleaner/paperclip/lib/paperclip/url_generator.rb:21:in `<class:UrlGenerator>'
  from /Users/lordvacuumcleaner/paperclip/lib/paperclip/url_generator.rb:4:in `<module:Paperclip>'
  from /Users/lordvacuumcleaner/paperclip/lib/paperclip/url_generator.rb:3:in `<top (required)>'
  from /Users/lordvacuumcleaner/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /Users/lordvacuumcleaner/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /Users/lordvacuumcleaner/paperclip/lib/paperclip/attachment.rb:3:in `<top (required)>'
  from /Users/lordvacuumcleaner/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /Users/lordvacuumcleaner/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /Users/lordvacuumcleaner/paperclip/lib/paperclip.rb:44:in `<top (required)>'
  from /Users/lordvacuumcleaner/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /Users/lordvacuumcleaner/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from (irb):3
  from /Users/lordvacuumcleaner/.rvm/rubies/ruby-2.3.1/bin/irb:11:in `<main>'

[krisleech]

I get this error in specs too, adding require 'active_support/core_ext/module/delegation' before require 'paperclip' fixes it.

In spec_helper:

require 'active_support/core_ext/module/delegation' # needed
require "paperclip"

paperclip_tmp = File.join(File.dirname(__FILE__), "fixtures/tmp")

Paperclip::Attachment.default_options[:path] = paperclip_tmp
Paperclip.options[:log] = false

[istana]

I created a pull request in January, but haven't been merged yet