Ruby 2.1!

Ruby 1.9.2 is pretty ancient as these things go, so let's upgrade. This pull request bumps the version to Ruby 2.1.1, upgrading Capybara along the way (and fixing a bunch of specs that subsequently broke).

The site works locally as far as I've tested, though I haven't tested the Magickly integration; we'll obviously want to test this thoroughly in staging.