rake refresh set incorrect content_type

[sbfaulkner]

When the content_type of the default style is different from the original, a rake refresh incorrectly changes the content_type to that of the default style.

[sbfaulkner]

Changing the refresh:metadata task to pass the :original style to to_file fixes this.

The fix is in my fork:
http://github.com/sbfaulkner/paperclip/commit/341fe6cef71e94868a4502519b15c8bd8a8ad7fa

(not sure how to write a test for it)

[sikachu]

Yes, I can see a problem when your default style is not :original. I think we should fix it according to your way.

[sikachu]

This has been merged. Thank you very much.