Add Identity#getId():IdentityId.

Author: Reinier Kip

src/Surfnet/Stepup/Identity/Api/Identity.php

@@ -81,6 +81,11 @@ public function provePossessionOfPhone(SecondFactorId $secondFactorId, PhoneNumb
      */
     public function verifyEmail($verificationNonce);
 
+    /**
+     * @return IdentityId
+     */
+    public function getId();
+
     /**
      * @return NameId
      */

src/Surfnet/Stepup/Identity/Identity.php

@@ -302,6 +302,11 @@ private function assertUserMayAddSecondFactor()
         }
     }
 
+    public function getId()
+    {
+        return $this->id;
+    }
+
     /**
      * @return NameId
      */