Added mini blogging application as Flask example.

This should become the tutorial.

examples/flaskr/templates/login.html

@@ -0,0 +1,14 @@
+{% extends "layout.html" %}
+{% block body %}
+  <h2>Login</h2>
+  {% if error %}<p class=error><strong>Error:</strong> {{ error }}{% endif %}
+  <form action="{{ url_for('login') }}" method=post>
+    <dl>
+      <dt>Username:
+      <dd><input type=text name=username>
+      <dt>Password:
+      <dd><input type=passowrd name=password>
+      <dd><input type=submit value=Login>
+    </dl>
+  </form>
+{% endblock %}