Rename 'ActiveSupport' integration tests to 'Rails' integration tests
Refactor Rails integration test setup code

Also change so that ActiveRecord setup happens before RR and the test framework
in question are loaded to better emulate a real-world app.
Add failing tests for Rails 4
Swallow errors that occur in adapter #applies?
Completely swallow errors that occur in adapter #load
Guard against registering an adapter twice
Fix TestUnit1 adapter to not error if Test::Unit::TestCase is undefined

This error manifested itself for some reason under Rails 4.