Please include tests in releases uploaded to rubygems

```
I am packaging origami for Debian, and having the tests included in the
releases lets us run them both during package build and on the Debian CI
service.

The current build system has a typo that makes the test files not be included
in the releases (except tc_pdf.rb which is listed in test_file). The attached
patch fixes that.

It would be really nice if you could make a new release after applying this
patch.
```

Original issue reported on code.google.com by `terce...@colivre.coop.br` on 10 Sep 2014 at 2:23

Attachments:
- [include-tests-in-releases.patch](https://storage.googleapis.com/google-code-attachments/origami-pdf/issue-25/comment-0/include-tests-in-releases.patch)