[03] Updated the application README
Added Ruby gems
Added Pry as the console for development
Generated Category, Author and Comment resources
Added additional columns to Article
Refactored the Elasticsearch integration into a concern

See:

* http://37signals.com/svn/posts/3372-put-chubby-models-on-a-diet-with-concerns
* http://joshsymonds.com/blog/2012/10/25/rails-concerns-v-searchable-with-elasticsearch/
Added a Sidekiq indexer

Run:

    $ bundle exec sidekiq --queue elasticsearch --verbose

See http://sidekiq.org
Added SearchController#index
Added Rails initializer with Elasticsearch configuration
Added Rake tasks for Elasticsearch
Added a seed script and source data