Have all error pages be rendered by Angular

Fixes #2198

Fixes https://www.pivotaltracker.com/story/show/135724483

templates/oauthorize.html

@@ -1,9 +1,5 @@
 {% extends "base.html" %}
 
-{% block added_meta %}
-  <base href="/">
-{% endblock %}
-
 {% block title %}
   <title>Authorize {{ application.name }} · Quay</title>
 {% endblock %}