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

Gemfile

@@ -49,6 +49,8 @@ gem 'sass-rails'
 gem 'coffee-rails'
 gem 'jquery-fileupload-rails'
 gem 'uglifier'
+gem 'turbolinks' # New for Rails 4.0
+
 # See https://github.com/sstephenson/execjs#readme for more supported runtimes
 # gem 'therubyracer', :platforms => :ruby
 
@@ -82,3 +84,9 @@ gem 'therubyracer'
 
 # Add SMTP server support using MailCatcher
 gem 'mailcatcher'
+
+#For Rails 4.0
+#group :doc do
+#  # bundle exec rake doc:rails generates the API under doc/api.
+#  gem 'sdoc', require: false
+#end