Allow apps specified custom `Zend\Authentication\Adapter\Http\ResolverInterface`

Now apps can specified its own resolver providing a custom 'ZF\MvcAuth\Authentication\AuthHttpAdapter' factory.

Developers can inherited from `ZF\MvcAuth\Factory\DefaultAuthHttpAdapterFactory` and call `setDigestResolver` and `setBasicResolver` methods to specified theirs own resolver.

Configured file resolver still have precedence.