Add PHP 5.6 and hhvm to travis-ci and remove .gitattributes from export

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

Signed-off-by: crynobone <crynobone@gmail.com>
Add `Orchestra\Notifier\GenericRecipient`.

Signed-off-by: crynobone <crynobone@gmail.com>
Move to PSR-4.

Signed-off-by: crynobone <crynobone@gmail.com>
Release v2.1.2

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