Add MultiCookie to make theming easier

event/event.go

@@ -65,3 +65,17 @@ func (broadcaster *FuncBroadcaster) Broadcast () {
 		listener()
 	}
 }
+
+type multiCookie []Cookie
+
+// MultiCookie creates a single cookie that, when closed, closes a list of other
+// cookies.
+func MultiCookie (cookies ...Cookie) Cookie {
+	return multiCookie(cookies)
+}
+
+func (cookies multiCookie) Close () {
+	for _, cookie := range cookies {
+		cookie.Close()
+	}
+}