Initial commit
Adding default rake tasks
Adding runtime and development gem dependencies
Rubocop string interpolation
Rough HolidayList implementation

Need to:

- Move classes into separate files
- Merge Holiday::List and HolidayList
- Remove ActiveRecord::Base dependency
- Add unit tests
Merge Holiday::List and Holidaylist and some cleanup

- rubocop suggested cleanup
- added a configuration object
Move classes into own files
Use active_support.to_query instead of active_record
Clean up unnecessary holiday folder structure
Extract argument_error!
Add optional error message functionality
Add console rake task
Rename to holiday_list
Cleanup test descriptions
Add configuration spec
Params tests
Add todos to readme
Add request string spec
Cleaning up long lines
Switch HTTP client library to faraday