* Replaces second_user_id and third_user_id with co_author_ids on the Articles table
* Adjusts migration that adds co_author_ids to also add array: true
* Replaces second_user_id and third_user_id with co_author_ids in all applicable files
- Use co_author_ids in _individual_article view
- Use co_author_ids in articles and stories controllers
- Use co_author_ids in article and podcast_episode models
- Use co_author_ids in article_dashboard
- Use co_author_ids in comments_helper
- Use co_author_ids in articles_spec
* Replaces second_user_id and third_user_id with co_author_ids in article.rb model
* Remove unused #assign_co_authors method from the Stories::Controller
* Add #co_authors and #co_author_name_and_path to article_decorator.rb
* Adds a descriptive form field for co_author_ids for Admins in /admin/articles
* Adds a conditional in article/show.html.erb to render co_author names on an Article in a human-readable way
* Replaces get_co_author_name_and_path with proper method name, co_author_name_and_path in show.html.erb
* Adds latest schema to (hopefully) resolve Travis conflicts
* Adds the safe operator to show.html.erb
* Adjusts articles_spec.rb to use an array in the first test
* Replaces unless &.empty? with if ./present? in articles/show.html.erb
* Replaces second_user_id with co_author_ids in stories_show_spec.rb test
* Replaces elsif with else in articles/show.html.erb
* Cleans up show.html.erb by removing conditional in favor of decorator method
* Refactors splitting of params in Articles::Controller and optimizes query in #co_authors
* Reverts removal of second_user_id and third_user_id and migration file
* Adds a data_update script to update co_author_ids with existing second and third user_ids
* Adds validations to co_authors and flash_messages to indicate whether an update was successful or not
- Adds to methods to article.rb to validate the IDs of co_authors and authors
- Adds flash messages to the Admin::Articles::Controller and a redirect to the show page
- Removes the JS highlighting upon submit when updating an Article in Admin
- Refactors #update action in Admin::Articles::Controller
* Adds tests to article_spec.rb around co_author_id validations in article.rb
* Adjusts #validate_co_authors_must_not_be_the_same to use .include? instead
* Uses Field::Select.with_options in article_dashboard.rb to properly display co_author_ids
* Reverts removal of assigning co_author_ids in the Stories::Controller
* Adjusts error message and adjusts return logic in article.rb (thanks, Fernando!)
* Fixes failing article_spec.rb test that checks for co_author_ids uniqueness
* Adds a default array to co_author_ids and checks if they are .blank?
* Refactor data_update script to use a single SQL statement (thank you, Michael)
* Preserve array order of co_author_ids in article_decorator.rb
* Add db file for default: []
* Add validation to fix bug related to text inputs and invalid users when adding co_authors
* Adds tests to ensure that co_author_ids are both an integer and an integer > 0
* Updates admin/articles_spec.rb to default [] instead of nil
* Adjusts validations in article.rb to be DRY-er and more consistent
* Consolidates validations further
* Refactors validations in article.rb to use procs
* Refactors data_update script to remove nil values from array
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