Make file extension configurable in supervisord.conf in order to facilitate using debian defaults
Allow overriding of conf_dir and conf_ext in supervisor class

 * bootstrap rspec testing
 * add a test for overriding conf_dir and conf_ext
Ignore Gemfile.lock
Update README.rst

Now without markdown!
Use code blocks in README.rst
Merge pull request #41 from Jimdo/master

Improvement: File extension configurable in supervisord.conf in order to facilitate using debian defaults