- Correct the README.md to reflect the fix in the last release

- Exclude the output file from the input list if any
  * The input folder with '-' (dash) string should now work without any problem.

- Use `pdfs2pdf_<base_name>.pdf` as output file
- Update `rubocop` to 0.23.x version
- Update rubocop style rule in .rubocop.yml

- Re-instate the `--base-dir` option and make relative path work correctly
- Respect the `--recursive` option
- Minor code cleanup

- Simplify the CLI interface
  * remove `--base-dir` as it must always be the current directory
  * remove the intermediate command in the `bin/pdfs2pdf`
- Cleanup the style with rubocop
- Make `--version` work properly

- First [Semantic Versioning][] version
- Update gemspec file

- Releases that do not follow Semantic Versioning
- Implement new features and fix a few bugs a long the way

[Ghostscript]: http://www.ghostscript.com/
[Wkhtmltopdf]: http://wkhtmltopdf.org/
[Semantic Versioning]: http://semver.org/