New rate based animation example

diff --git a/examples/07-rate-based-animations/07-rate-based-animations.scm b/examples/07-rate-based-animations/07-rate-based-animations.scm
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+++ b/examples/07-rate-based-animations/07-rate-based-animations.scm
@@ -0,0 +1,27 @@
+#!/usr/bin/env guile
+!#
+
+;;; Gacela, a GNU Guile extension for fast games development
+;;; Copyright (C) 2017 by Javier Sancho Fernandez <jsf at jsancho dot org>
+;;;
+;;; This program is free software: you can redistribute it and/or modify
+;;; it under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation, either version 3 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; This program is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+(use-modules (gacela))
+
+(define bart (image "bart.png"))
+
+(display-scene
+  (window ((resolution '(640 480)))
+    (context ((x (- (at-rate 1) 1)))
+      (move bart x 0))))

diff --git a/examples/07-rate-based-animations/bart.png b/examples/07-rate-based-animations/bart.png
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