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

test/test_helper.rb

@@ -1,4 +1,4 @@
-ENV["RAILS_ENV"] = "test"
+ENV["RAILS_ENV"] ||= "test"
 
 # To use simplecov, do this: COVERAGE=true rake
 require 'simplecov'
@@ -8,6 +8,8 @@ require File.expand_path('../../config/environment', __FILE__)
 require 'rails/test_help'
 
 class ActiveSupport::TestCase
+  # Maybe for Rails 4.0: ActiveRecord::Migration.check_pending!
+
   # Setup all fixtures in test/fixtures/*.(yml|csv) for all tests in alphabetical order.
   #
   # Note: You'll currently still have to declare fixtures explicitly in integration tests