Moved AR include into a configure method to prevent non-inclusion when using the…

Moved AR include into a configure method to prevent non-inclusion when using the git repo in the Gemfile

lib/paperclip.rb

@@ -70,6 +70,12 @@ module Paperclip
       }
     end
 
+    def configure
+      ActiveRecord::Base.send(:include, Paperclip)
+      File.send(:include, Paperclip::Upfile)
+      yield(self) if block_given?
+    end
+
     def path_for_command command #:nodoc:
       if options[:image_magick_path]
         warn("[DEPRECATION] :image_magick_path is deprecated and will be removed. Use :command_path instead")
@@ -358,9 +364,3 @@ module Paperclip
   end
 
 end
-
-# Set it all up.
-if Object.const_defined?("ActiveRecord")
-  ActiveRecord::Base.send(:include, Paperclip)
-  File.send(:include, Paperclip::Upfile)
-end