Add conversation deletion

api/client.go

@@ -550,7 +550,7 @@ func (c *Client) DeleteContact(partnerId *id.ID) error  {
 	if err := c.storage.Auth().Delete(partnerId); err != nil {
 		return err
 	}
-
+	c.storage.Conversations().Delete(partnerId)
     // todo: find a way to clean partition up?
 	//c.storage.Partition().Clean()
 	return nil