Rails 4.1

This is an upgrade to the latest version of Rails 4.1 - in this case, 4.1.5. It brings with it upgrades to RSpec, Capybara & capybara-webkit, Angular, Bourbon, byebug, dalli, dotenv, factory_girl_rails, faraday, font-awesome-rails, and many others. Rails dependencies are a tangled web.

Thanks to @salbertson and @georgebrock  for debugging help.

The capybara and Rspec combination causes a deprecation warning; hopefully this will go away with the next capybara upgrade.
Why this change?