Added a 'whiny nil' that's aim to ensure that when users pass nil to methods where that isn't appropriate, instead of NoMethodError? and the name of some method used by the framework users will see a message explaining what type of object was expected. Only active in test and development environments by default #1209 [Michael Koziarski]

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Added ActionMailer::Base.deliver_method = :test to the test environment so that mail objects are available in ActionMailer::Base.deliveries for functional testing.

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Added ActionMailer::Base.raise_delivery_errors = false to the test environment as we checks will be performed against deliveries array instead.

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