Added authentication validator to ease implementing authentication validation on forms
Resolved coding standard violations
Updated AbstractAdapter based on feedback to provide a validatable adapter interface, changed contract in the Authentication validator to ensure that the adapter must be a ValidatableAdapterInterface
Merge branch 'feature/zend-authentication-validator' of git://github.com/mwillbanks/zf2 into feature/3420
Merge branch 'feature/3420' into develop

Close #3420