Add NotifiableTrait

Signed-off-by: Ahmad Shah Hafizan Hamidin <ahmadshahhafizan@gmail.com>
Merge pull request #5 from ahmadshah/feature/notifiable-trait

Add NotifiableTrait for Orchestra\Notifier
Add missing use Orchestra\Support\Fluent.

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

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

Signed-off-by: crynobone <crynobone@gmail.com>
Fixes all bugs with testcases.

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