Add nokogiri as a dependency
Fix bug with duplicate error messages in Guard (TODO find workaround to still be able to use documentation format). Change code style in accordance with rubocop
Add integrations table to track when integrations were run. Use tracked integrations to determine if a new integration needs to be run or if the previously integrated MenuItems are already up-to-date. Add tests for this functionality as well as for slight refactoring of TacoBellIntegration. Minor changes in code style