README.{markdown,md}

```
sprinkle at /Users/koenpunt/.rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/bundler/gems/sprinkle-e16a30a4d553 did not have a valid gemspec.
This prevents bundler from installing bins or native extensions, but that may not affect its functionality.
The validation message from Rubygems was:
  ["README.markdown"] are not files
```