feature: Change to a Rails 4 ActiveModel validator. #11
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Closes #10
Rails 4 introduced ActiveModel, ActiveModel::Validations and ActiveModel::EachValidator. Instead of injecting ourselves into ActiveRecord::Base, we will be automatically picked up.
We can now also be used on ActiveModel as well as ActiveRecord. This simplifies testing.
This does mean it requires at least Rails 4. If that's unacceptable I can add a shim for Rails 3.
Also
We only needed one convenience method, errors_on. It has been copied into our test model.