Return error during plugin registration for invalid options. #49
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Crumb was throwing an exception for invalid options rather than returning an error to the registration function callback (http://hapijs.com/api#serverregisterplugins-options-callback).
This PR changes the behaviour to return an error to the registration function callback. I'm not sure what the preferred behaviour is - I noticed that the lout plugin returns an error (rather than throwing - https://github.com/hapijs/lout/blob/master/lib/index.js#L43) - this change mimics that behaviour.