Upgrade delayed_job_active_record to 0.4 series.
Upgrade haml to 4.0 series.
Remove explicit requirement of mail gem.
Upgrade mysql gem to 2.9 series.
Upgrade rdiscount to 2.0 series.
Switch to mysql2 gem.
Upgrade capistrano to 2.14 series.
Note why we're not using Capybara 2.0 yet.