Add .gitattributes to export ignore.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.1' into 2.2
Add Orchestra\Support\Traits\ObservableTrait.

Signed-off-by: crynobone <crynobone@gmail.com>
Add Orchestra\Support\Traits\ValidationTrait.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.2'