Fix EntrustRoleTrait

Fix save/delete/restore methods to return value as it designed in "Illuminate\Database\Eloquent\Model" and "Illuminate\Database\Eloquent\SoftDeletes"
This restore expected behavior of save/delete/restore methods in inherited classes

src/Entrust/Traits/EntrustRoleTrait.php

@@ -24,18 +24,27 @@ public function cachedPermissions()
     }
     public function save(array $options = [])
     {   //both inserts and updates
-        parent::save($options);
+        if(!parent::save($options)){
+            return false;
+        }
         Cache::tags(Config::get('entrust.permission_role_table'))->flush();
+        return true;
     }
     public function delete(array $options = [])
     {   //soft or hard
-        parent::delete($options);
+        if(!parent::delete($options)){
+            return false;
+        }
         Cache::tags(Config::get('entrust.permission_role_table'))->flush();
+        return true;
     }
     public function restore()
     {   //soft delete undo's
-        parent::restore();
+        if(!parent::restore()){
+            return false;
+        }
         Cache::tags(Config::get('entrust.permission_role_table'))->flush();
+        return true;
     }
 
     /**