[Patch Review] Make TestUploadFile content_type writable

Hi there,

Writing some controller specs for uploading files this morning I was having problems because TestUploadfile.content_type isn’t writable. I’ve submitted a really simple patch with a tweaked test:

http://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/920

Cheers,

Tim.

Applied. Thanks Tim!

jeremy