write some docs and fixup demo

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+Hacking
+=======
+A plugin are expected to implement a function :code:`register(lightbox)` which will be called when passed the plugin to `LightBox.Core::registerPlugin`. See the full API at :doc:`api`.
+
+A basic plugin could look like this.
+
+.. code-block:: js
+    :caption: LightBox.Contrib.MyExitPlugin.js
+
+    class MyExitPlugin {
+
+        register(lightbox) {
+            lightbox.addOnEndListener(this.exited.bind(this));
+        }
+
+        exited() {
+            console.log('lightbox exited');
+        }
+
+    }