Platform update: Ruby 2.1 preview, locale, new Postgres, MongoDB, Firefox

The latest platform release introduces several upgrades, including the addition of Ruby 2.1.0-preview1, which offers new features such as refinements, required keyword arguments, and improved method caching for testing in applications. The default locale has been changed to en_US.UTF-8 to address issues experienced by some users with the previous setting. Postgres has been updated to version 9.3, enhancing the JSON datatype capabilities, while MongoDB is now at version 2.4.7, supporting text search and symbol returns from the aggregation framework. Additionally, Firefox has been upgraded, and users are advised to update selenium-webdriver via bundle update. Further details are available in the platform changelog, and discussions can be joined on their Discord channel.