Add config file.

Signed-off-by: crynobone <crynobone@gmail.com>
Move Orchestra\Foundation\Mail to Orchestra\Notifier\Mailer.

Signed-off-by: crynobone <crynobone@gmail.com>
Add basic service provider.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.1'