Added a more detailed callback view

app/templates/piston/callback_view.html

@@ -0,0 +1,13 @@
+{% extends "base.html" %}
+
+{% block title %}OAuth Access Authorization{% endblock %}
+
+{% block content %}
+
+<h1>Access Authorization</h1>
+
+    <p>Access is now enabled for the requesting application. It seems the application did not provide a way to give it the required information so you need to provide this to it. This has happened either due to it being a desktop application or not being configured properly.</p>
+
+    <p>Token/PIN: <b>{{ token }}</td></p>
+
+{% endblock %}