Remove pry as development dependency, but move to Gemfile
Add newline to file
Add describe block to .ping
Add RSpec, and configure
Write specs for the Luhn class
Refactor the Luhn module to include the Base class which was the former Lunc class
Remove Minitest from gem and switch to RSpec completly.
Bump version to 0.0.3
Add the gem task back to the Rakefile