Refactored sorting_filters into a tuple and moved logic for retrieving sorting filters into the sort_view versus changelist_view.

Updated readme.
Updated sample project to leverage new sorting_filters on Person model and admin.
Removed custom change list template for Person admin.

sample_project/templates/app/person/admin/change_list_with_sort_link.html

@@ -1,9 +0,0 @@
-{% extends change_list_template_extends %}
-{% load i18n %}
-
-{% block object-tools-items %}
-	<li>
-		<a href="./sort/">{% trans 'Change Order of Board Members' %}</a>
-	</li>
-	{{ block.super }}
-{% endblock %}