Double Shot #1472

Ruby DSL Handbook - New book in beta, $12 gets you early access. By Jim Gay, the author of Clean Ruby.
Working with the ELK Stack at Skroutz - Elasticsearch, Logstash, Kibana for crunching through a bunch of data.
Git v2.3 Release Notes - Nothing huge, lots of little tweaks.
Ship Code Faster: Announcing GitHub Integration GA - Push to GitHub, fresh code deploys to Heroku after it passes your CI.