Change the travis S3 bucket name to use test, not development.

- Also use question.image_url instead of question.image.file.url
- Should fix the build.

commit d2a80ae9695adffca0d5a352d1f3d16cc4ff9892
Author: Timothy Andrew <mail@timothyandrew.net>
Date:   Wed Jun 5 17:40:57 2013 +0530

commit 65113e83170a5f813dd33ec66f7a41b041df05c0
Author: Timothy Andrew <mail@timothyandrew.net>
Date:   Wed Jun 5 17:40:50 2013 +0530