Plays nice with gemspec, even with a path or other options. Tested.
support gemspec. Fixes #1
Thanks for the patch. I tried this out locally, but the existing tests are failing with the changes. I think you'll need to add a check to make sure that a gemspec exists before trying to add it to the output files, to handle cases where a gemspec directive doesn't exist.
Add support for `gemspec` in the Gemfile
I've modified a patch from @josephholsten to make it work as expected.
This has been adapted and applied.