kernow / shortcode / 145

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Pull #56

travis-ci

Allow presenters to define initialize via inheritance

It would be nice to be able to define a BasePresenter that defines some
base helper methods or even defines a default behavior for the 4
required methods. Then it would be up to any child classes to override
that default behavior.

Currently this is possible for `self.for`, `content`, and `attributes`.
But initialize is weird because `Object` defines initialize and we don't
want that to "count".

So in order to support the initialize being inheritable to child
classes, I've changed the condition around when we throw the validation
error to check the presenter's class ancestory _until_ we reach Object.
At that point we assume failure and raise the validation error.

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