more user handling features of flask-security activated

Now users can recover their passwords and change them while
logged in.

app/templates/security/change_password.html

@@ -0,0 +1,13 @@
+{% extends "layout.html" %}
+{% from "security/_macros.html" import render_field_with_errors, render_field %}
+
+{% block body %}
+<h1>Change password</h1>
+<form class='form-horizontal' action="{{ url_for_security('change_password') }}" method="POST" name="change_password_form">
+  {{ change_password_form.hidden_tag() }}
+  {{ render_field_with_errors(change_password_form.password) }}
+  {{ render_field_with_errors(change_password_form.new_password) }}
+  {{ render_field_with_errors(change_password_form.new_password_confirm) }}
+  {{ render_field(change_password_form.submit) }}
+</form>
+{% endblock %}