* Get specs passing with latest versions of
* ActiveRecord 4.0.4
* ActiveSupport 4.0.4
* MongoMapper 0.13.0
* Mongoid 4.0.0
* ActionView 4.0.4
* Ripple seems to be abandoned so no changes made.
* Clean up ActiveRecord setup:
* Creating tableless AR objects seems even trickier in Rails 4 so
simplify testing setup by using an in-memory SQLite DB back-end.
Conflicts:
spec/ext/active_record_spec.rb
