Adding a feature-animation example

examples/feature-animation.html

@@ -0,0 +1,15 @@
+---
+template: example.html
+title: Feature animation example
+shortdesc: Demonstrates how to animate features.
+docs: >
+  This example shows how to use <b>postcompose</b> and <b>vectorContext</b> to
+  animate features. Here we choose to do a flash animation each time a feature
+  is added to the layer.
+tags: "animation, vector, feature, flash"
+---
+<div class="row">
+  <div class="span8">
+    <div id="map" class="map"></div>
+  </div>
+</div>