Maintain order of views on router for api root view.

rest_framework/routers.py

@@ -16,7 +16,7 @@ For example, you might have a `urls.py` that looks something like this:
 from __future__ import unicode_literals
 
 import itertools
-from collections import namedtuple
+from collections import namedtuple, OrderedDict
 from django.conf.urls import patterns, url
 from django.core.exceptions import ImproperlyConfigured
 from django.core.urlresolvers import NoReverseMatch
@@ -277,7 +277,7 @@ class DefaultRouter(SimpleRouter):
         """
         Return a view to use as the API root.
         """
-        api_root_dict = {}
+        api_root_dict = OrderedDict()
         list_name = self.routes[0].name
         for prefix, viewset, basename in self.registry:
             api_root_dict[prefix] = list_name.format(basename=basename)
@@ -286,7 +286,7 @@ class DefaultRouter(SimpleRouter):
             _ignore_model_permissions = True
 
             def get(self, request, *args, **kwargs):
-                ret = {}
+                ret = OrderedDict()
                 for key, url_name in api_root_dict.items():
                     try:
                         ret[key] = reverse(