Fixes a stupid bit of name generation.

lib/paperclip/storage/s3.rb

@@ -127,10 +127,10 @@ module Paperclip
       # style, in the format most representative of the current storage.
       def to_file style = default_style
         return @queued_for_write[style] if @queued_for_write[style]
-        filename = path(style).split(".")
+        filename = path(style)
         extname  = File.extname(filename)
         basename = File.basename(filename, extname)
-        file = Tempfile.new(basename, extname)
+        file = Tempfile.new([basename, extname])
         file.write(AWS::S3::S3Object.value(path(style), bucket_name))
         file.rewind
         return file

test/storage_test.rb

@@ -351,6 +351,11 @@ class StorageTest < Test::Unit::TestCase
           should "be on S3" do
             assert true
           end
+
+          should "generate a tempfile with the right name" do
+            file = @dummy.avatar.to_file
+            assert_match /^original.*\.png$/, File.basename(file.path)
+          end
         end
       end
     end