Avoid caching fallback instance since this could cause multiple
redundant insertion to the database.

Signed-off-by: crynobone <crynobone@gmail.com>
Allow to get handler instance using `Orchestra\Memory\Provider::getHandler()`.

Signed-off-by: crynobone <crynobone@gmail.com>
Add `Orchestra\Memory\Abstractable\Handler::getStorageName()` and `Orchestra\Memory\Abstractable\Handler::getName()` helper method.

Signed-off-by: crynobone <crynobone@gmail.com>
Multiple fixes related to orchestral/auth#25

Signed-off-by: crynobone <crynobone@gmail.com>