Rename drag-features example to custom-interactions

examples/custom-interactions.html

@@ -0,0 +1,14 @@
+---
+template: example.html
+title: Custom interaction example
+shortdesc: Example of a custom interaction.
+docs: >
+  This example demonstrates creating a custom interaction by subclassing `ol.interaction.Pointer`.
+  Note that the built in interaction `ol.interaction.Translate` might be a better option for moving features.
+tags: "drag, feature, vector, editing, custom, interaction"
+---
+<div class="row-fluid">
+  <div class="span12">
+    <div id="map" class="map"></div>
+  </div>
+</div>