More Rails 4.0 upgrade changes

1. Compared existing branch with empty Rails 4.0 project and
    made changes as needed.
 2. Fix find/first warning.
 3. Fix sqlite timeout issue.
    -- config/database.yml
    -- spec/vulnerabilities/insecure_dor_spec.rb

config/application.rb

@@ -2,6 +2,8 @@ require File.expand_path('../boot', __FILE__)
 
 require 'rails/all'
 
+# Require the gems listed in Gemfile, including any gems
+# you've limited to :test, :development, or :production.
 Bundler.require(:default, Rails.env)
 
 module Railsgoat