Let's at least be disposable, so we can clean up after ourselves

src/ol/interaction/interaction.js

@@ -2,6 +2,7 @@
 
 goog.provide('ol.interaction.Interaction');
 
+goog.require('goog.Disposable');
 goog.require('ol.MapBrowserEvent');
 goog.require('ol.animation.pan');
 goog.require('ol.animation.rotate');
@@ -12,9 +13,12 @@ goog.require('ol.easing');
 
 /**
  * @constructor
+ * @extends {goog.Disposable}
  */
 ol.interaction.Interaction = function() {
+  goog.base(this);
 };
+goog.inherits(ol.interaction.Interaction, goog.Disposable);
 
 
 /**