JahtmlFormatter tweakes the CSS of the Rspec HtmlFormatter to make it better for me to print to pdf and include in V&V Reports. Fun stuff. It it probably not very useful or interesting to anyone else.
$ bundle exec rspec --format JahtmlFormatter -o spec_output.html
To use JahtmlFormatter by default, put the options in a .rspec file:
--format JahtmlFormatter -o spec_output.html
This is likely not very interesting to contribute to either. :)