Update changelog.

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

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

Signed-off-by: crynobone <crynobone@gmail.com>
Update changes on orchestra/auth.

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