Upgrade Ruby to 2.0.0
Ignore .ruby-gemset

Let everybody choose whether they want to use a custom gemset.
Upgrade all the gems

This is prior to upgrading to Rails 4. We've left Cucumber to 1.2.5,
because (1) 1.3 does not support spork and (2) 1.3 gives deprecation
warnings on Table#diff!.
Upgrade to Rails 4.0.0
Remove the encoding comment from the ruby files

They finally fixed this in Ruby 2.0!