Fix a failing test.

Fixes #913

lib/paperclip/attachment.rb

@@ -294,6 +294,7 @@ module Paperclip
       saved_only_process, @options[:only_process] = @options[:only_process], style_args
       begin
         assign(self)
+        save
         instance.save
       rescue Errno::EACCES => e
         warn "#{e} - skipping file."

test/integration_test.rb

@@ -466,7 +466,7 @@ class IntegrationTest < Test::Unit::TestCase
         @dummy.avatar.options[:styles][:mini] = "25x25#"
         @dummy.avatar.instance_variable_set :@normalized_styles, nil
         Time.stubs(:now => Time.now + 10)
-        @dummy.avatar.reprocess! 'mini'
+        @dummy.avatar.reprocess!
         @dummy.reload
       end