Update default login template and add security state to app context processory

example/templates/login.html

@@ -1,11 +0,0 @@
-{% include "_messages.html" %}
-{% include "_nav.html" %}
-<form action="{{ url_for_security('authenticate') }}" method="POST" name="login_form">
-  {{ form.hidden_tag() }}
-  {{ form.email.label }} {{ form.email }}<br/>
-  {{ form.password.label }} {{ form.password }}<br/>
-  {{ form.remember.label }} {{ form.remember }}<br/>
-  {{ form.next }}
-  {{ form.submit }}
-</form>
-<p>{{ content }}</p>