diff --git a/docs/index.md b/docs/index.md
index b9806c544..1760ce916 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -261,7 +261,7 @@ Framework.
 
 For support please see the [REST framework discussion group][group], try the  `#restframework` channel on `irc.freenode.net`, search [the IRC archives][botbot], or raise a  question on [Stack Overflow][stack-overflow], making sure to include the ['django-rest-framework'][django-rest-framework-tag] tag.
 
-[Paid support is available][paid-support] from [DabApps][dabapps], and can include work on REST framework core, or support with building your REST framework API.  Please [contact DabApps][contact-dabapps] if you'd like to discuss commercial support options.
+For priority support please sign up for a [professional or premium sponsorship plan](https://fund.django-rest-framework.org/topics/funding/).
 
 For updates on REST framework development, you may also want to follow [the author][twitter] on Twitter.
 
diff --git a/docs/topics/funding.md b/docs/topics/funding.md
index 814de0a3c..91099cb3f 100644
--- a/docs/topics/funding.md
+++ b/docs/topics/funding.md
@@ -308,7 +308,7 @@ Our professional and premium plans also include **priority support**. At any tim
 
 Once you've signed up I'll contact you via email and arrange your ad placements on the site.
 
-For further enquires please contact <a href=mailto:tom@tomchristie.com>tom@tomchristie.com</a>.
+For further enquires please contact <a href=mailto:funding@django-rest-framework.org>funding@django-rest-framework.org</a>.
 
 ---
 
diff --git a/rest_framework/compat.py b/rest_framework/compat.py
index b0e076203..16bc41f3a 100644
--- a/rest_framework/compat.py
+++ b/rest_framework/compat.py
@@ -17,11 +17,6 @@ from django.template import Context, RequestContext, Template
 from django.utils import six
 from django.views.generic import View
 
-try:
-    import importlib  # Available in Python 3.1+
-except ImportError:
-    from django.utils import importlib  # Will be removed in Django 1.9
-
 
 try:
     from django.urls import (
@@ -312,3 +307,10 @@ def set_many(instance, field, value):
     else:
         field = getattr(instance, field)
         field.set(value)
+
+def include(module, namespace=None, app_name=None):
+    from django.conf.urls import include
+    if django.VERSION < (1,9):
+        return include(module, namespace, app_name)
+    else:
+        return include((module, app_name), namespace)
diff --git a/rest_framework/settings.py b/rest_framework/settings.py
index 6d9ed2355..b699d7caf 100644
--- a/rest_framework/settings.py
+++ b/rest_framework/settings.py
@@ -18,13 +18,13 @@ REST framework settings, checking for user settings first, then falling
 back to the defaults.
 """
 from __future__ import unicode_literals
+from importlib import import_module
 
 from django.conf import settings
 from django.test.signals import setting_changed
 from django.utils import six
 
 from rest_framework import ISO_8601
-from rest_framework.compat import importlib
 
 DEFAULTS = {
     # Base API policies
@@ -174,7 +174,7 @@ def import_from_string(val, setting_name):
         # Nod to tastypie's use of importlib.
         parts = val.split('.')
         module_path, class_name = '.'.join(parts[:-1]), parts[-1]
-        module = importlib.import_module(module_path)
+        module = import_module(module_path)
         return getattr(module, class_name)
     except (ImportError, AttributeError) as e:
         msg = "Could not import '%s' for API setting '%s'. %s: %s." % (val, setting_name, e.__class__.__name__, e)
diff --git a/rest_framework/test.py b/rest_framework/test.py
index 241f94c91..87255bca0 100644
--- a/rest_framework/test.py
+++ b/rest_framework/test.py
@@ -114,7 +114,7 @@ if requests is not None:
             self.mount('https://', adapter)
 
         def request(self, method, url, *args, **kwargs):
-            if ':' not in url:
+            if not url.startswith('http'):
                 raise ValueError('Missing "http:" or "https:". Use a fully qualified URL, eg "http://testserver%s"' % url)
             return super(RequestsClient, self).request(method, url, *args, **kwargs)
 
diff --git a/rest_framework/urlpatterns.py b/rest_framework/urlpatterns.py
index 4ea55300e..2ce4ba52d 100644
--- a/rest_framework/urlpatterns.py
+++ b/rest_framework/urlpatterns.py
@@ -1,8 +1,8 @@
 from __future__ import unicode_literals
 
-from django.conf.urls import include, url
+from django.conf.urls import url
 
-from rest_framework.compat import RegexURLResolver
+from rest_framework.compat import RegexURLResolver, include
 from rest_framework.settings import api_settings
 
 
diff --git a/rest_framework/utils/formatting.py b/rest_framework/utils/formatting.py
index ca5b33c5e..78cb37e56 100644
--- a/rest_framework/utils/formatting.py
+++ b/rest_framework/utils/formatting.py
@@ -32,23 +32,18 @@ def dedent(content):
     unindented text on the initial line.
     """
     content = force_text(content)
-    whitespace_counts = [
-        len(line) - len(line.lstrip(' '))
-        for line in content.splitlines()[1:] if line.lstrip()
-    ]
-    tab_counts = [
-        len(line) - len(line.lstrip('\t'))
-        for line in content.splitlines()[1:] if line.lstrip()
-    ]
+    lines = [line for line in content.splitlines()[1:] if line.lstrip()]
 
     # unindent the content if needed
-    if whitespace_counts:
-        whitespace_pattern = '^' + (' ' * min(whitespace_counts))
-        content = re.sub(re.compile(whitespace_pattern, re.MULTILINE), '', content)
-    elif tab_counts:
-        whitespace_pattern = '^' + ('\t' * min(whitespace_counts))
-        content = re.sub(re.compile(whitespace_pattern, re.MULTILINE), '', content)
-
+    if lines:
+        whitespace_counts = min([len(line) - len(line.lstrip(' ')) for line in lines])
+        tab_counts = min([len(line) - len(line.lstrip('\t')) for line in lines])
+        if whitespace_counts:
+            whitespace_pattern = '^' + (' ' * whitespace_counts)
+            content = re.sub(re.compile(whitespace_pattern, re.MULTILINE), '', content)
+        elif tab_counts:
+            whitespace_pattern = '^' + ('\t' * tab_counts)
+            content = re.sub(re.compile(whitespace_pattern, re.MULTILINE), '', content)
     return content.strip()
 
 
diff --git a/tests/test_description.py b/tests/test_description.py
index 08d8bddec..001a3ea21 100644
--- a/tests/test_description.py
+++ b/tests/test_description.py
@@ -124,4 +124,8 @@ class TestViewNamesAndDescriptions(TestCase):
 
 
 def test_dedent_tabs():
-    assert dedent("\tfirst string\n\n\tsecond string") == 'first string\n\n\tsecond string'
+    result = 'first string\n\nsecond string'
+    assert dedent("    first string\n\n    second string") == result
+    assert dedent("first string\n\n    second string") == result
+    assert dedent("\tfirst string\n\n\tsecond string") == result
+    assert dedent("first string\n\n\tsecond string") == result
diff --git a/tests/test_generics.py b/tests/test_generics.py
index c24cda006..59278572e 100644
--- a/tests/test_generics.py
+++ b/tests/test_generics.py
@@ -547,3 +547,94 @@ class TestGuardedQueryset(TestCase):
         request = factory.get('/')
         with pytest.raises(RuntimeError):
             view(request).render()
+
+
+class ApiViewsTests(TestCase):
+
+    def test_create_api_view_post(self):
+        class MockCreateApiView(generics.CreateAPIView):
+            def create(self, request, *args, **kwargs):
+                self.called = True
+                self.call_args = (request, args, kwargs)
+        view = MockCreateApiView()
+        data = ('test request', ('test arg',), {'test_kwarg': 'test'})
+        view.post('test request', 'test arg', test_kwarg='test')
+        assert view.called is True
+        assert view.call_args == data
+
+    def test_destroy_api_view_delete(self):
+        class MockDestroyApiView(generics.DestroyAPIView):
+            def destroy(self, request, *args, **kwargs):
+                self.called = True
+                self.call_args = (request, args, kwargs)
+        view = MockDestroyApiView()
+        data = ('test request', ('test arg',), {'test_kwarg': 'test'})
+        view.delete('test request', 'test arg', test_kwarg='test')
+        assert view.called is True
+        assert view.call_args == data
+
+    def test_update_api_view_partial_update(self):
+        class MockUpdateApiView(generics.UpdateAPIView):
+            def partial_update(self, request, *args, **kwargs):
+                self.called = True
+                self.call_args = (request, args, kwargs)
+        view = MockUpdateApiView()
+        data = ('test request', ('test arg',), {'test_kwarg': 'test'})
+        view.patch('test request', 'test arg', test_kwarg='test')
+        assert view.called is True
+        assert view.call_args == data
+
+    def test_retrieve_update_api_view_get(self):
+        class MockRetrieveUpdateApiView(generics.RetrieveUpdateAPIView):
+            def retrieve(self, request, *args, **kwargs):
+                self.called = True
+                self.call_args = (request, args, kwargs)
+        view = MockRetrieveUpdateApiView()
+        data = ('test request', ('test arg',), {'test_kwarg': 'test'})
+        view.get('test request', 'test arg', test_kwarg='test')
+        assert view.called is True
+        assert view.call_args == data
+
+    def test_retrieve_update_api_view_put(self):
+        class MockRetrieveUpdateApiView(generics.RetrieveUpdateAPIView):
+            def update(self, request, *args, **kwargs):
+                self.called = True
+                self.call_args = (request, args, kwargs)
+        view = MockRetrieveUpdateApiView()
+        data = ('test request', ('test arg',), {'test_kwarg': 'test'})
+        view.put('test request', 'test arg', test_kwarg='test')
+        assert view.called is True
+        assert view.call_args == data
+
+    def test_retrieve_update_api_view_patch(self):
+        class MockRetrieveUpdateApiView(generics.RetrieveUpdateAPIView):
+            def partial_update(self, request, *args, **kwargs):
+                self.called = True
+                self.call_args = (request, args, kwargs)
+        view = MockRetrieveUpdateApiView()
+        data = ('test request', ('test arg',), {'test_kwarg': 'test'})
+        view.patch('test request', 'test arg', test_kwarg='test')
+        assert view.called is True
+        assert view.call_args == data
+
+    def test_retrieve_destroy_api_view_get(self):
+        class MockRetrieveDestroyUApiView(generics.RetrieveDestroyAPIView):
+            def retrieve(self, request, *args, **kwargs):
+                self.called = True
+                self.call_args = (request, args, kwargs)
+        view = MockRetrieveDestroyUApiView()
+        data = ('test request', ('test arg',), {'test_kwarg': 'test'})
+        view.get('test request', 'test arg', test_kwarg='test')
+        assert view.called is True
+        assert view.call_args == data
+
+    def test_retrieve_destroy_api_view_delete(self):
+        class MockRetrieveDestroyUApiView(generics.RetrieveDestroyAPIView):
+            def destroy(self, request, *args, **kwargs):
+                self.called = True
+                self.call_args = (request, args, kwargs)
+        view = MockRetrieveDestroyUApiView()
+        data = ('test request', ('test arg',), {'test_kwarg': 'test'})
+        view.delete('test request', 'test arg', test_kwarg='test')
+        assert view.called is True
+        assert view.call_args == data
diff --git a/tests/test_pagination.py b/tests/test_pagination.py
index 9f2e1c57c..dd7f70330 100644
--- a/tests/test_pagination.py
+++ b/tests/test_pagination.py
@@ -370,6 +370,13 @@ class TestLimitOffset:
         assert self.pagination.display_page_controls
         assert isinstance(self.pagination.to_html(), type(''))
 
+    def test_pagination_not_applied_if_limit_or_default_limit_not_set(self):
+        class MockPagination(pagination.LimitOffsetPagination):
+            default_limit = None
+        request = Request(factory.get('/'))
+        queryset = MockPagination().paginate_queryset(self.queryset, request)
+        assert queryset is None
+
     def test_single_offset(self):
         """
         When the offset is not a multiple of the limit we get some edge cases:
diff --git a/tests/test_routers.py b/tests/test_routers.py
index 99e4391c0..dc3df2e7b 100644
--- a/tests/test_routers.py
+++ b/tests/test_routers.py
@@ -4,12 +4,13 @@ import json
 from collections import namedtuple
 
 import pytest
-from django.conf.urls import include, url
+from django.conf.urls import url
 from django.core.exceptions import ImproperlyConfigured
 from django.db import models
 from django.test import TestCase, override_settings
 
 from rest_framework import permissions, serializers, viewsets
+from rest_framework.compat import include
 from rest_framework.decorators import detail_route, list_route
 from rest_framework.response import Response
 from rest_framework.routers import DefaultRouter, SimpleRouter
@@ -81,7 +82,7 @@ empty_prefix_urls = [
 
 urlpatterns = [
     url(r'^non-namespaced/', include(namespaced_router.urls)),
-    url(r'^namespaced/', include(namespaced_router.urls, namespace='example')),
+    url(r'^namespaced/', include(namespaced_router.urls, namespace='example', app_name='example')),
     url(r'^example/', include(notes_router.urls)),
     url(r'^example2/', include(kwarged_notes_router.urls)),
 
diff --git a/tests/test_serializer.py b/tests/test_serializer.py
index 47258fdd1..04fa39c0d 100644
--- a/tests/test_serializer.py
+++ b/tests/test_serializer.py
@@ -159,6 +159,32 @@ class TestBaseSerializer:
 
         self.Serializer = ExampleSerializer
 
+    def test_abstract_methods_raise_proper_errors(self):
+        serializer = serializers.BaseSerializer()
+        with pytest.raises(NotImplementedError):
+            serializer.to_internal_value(None)
+        with pytest.raises(NotImplementedError):
+            serializer.to_representation(None)
+        with pytest.raises(NotImplementedError):
+            serializer.update(None, None)
+        with pytest.raises(NotImplementedError):
+            serializer.create(None)
+
+    def test_access_to_data_attribute_before_validation_raises_error(self):
+        serializer = serializers.BaseSerializer(data={'foo': 'bar'})
+        with pytest.raises(AssertionError):
+            serializer.data
+
+    def test_access_to_errors_attribute_before_validation_raises_error(self):
+        serializer = serializers.BaseSerializer(data={'foo': 'bar'})
+        with pytest.raises(AssertionError):
+            serializer.errors
+
+    def test_access_to_validated_data_attribute_before_validation_raises_error(self):
+        serializer = serializers.BaseSerializer(data={'foo': 'bar'})
+        with pytest.raises(AssertionError):
+            serializer.validated_data
+
     def test_serialize_instance(self):
         instance = {'id': 1, 'name': 'tom', 'domain': 'example.com'}
         serializer = self.Serializer(instance)
diff --git a/tests/test_versioning.py b/tests/test_versioning.py
index 195f3fec1..098b09b65 100644
--- a/tests/test_versioning.py
+++ b/tests/test_versioning.py
@@ -1,8 +1,9 @@
 import pytest
-from django.conf.urls import include, url
+from django.conf.urls import url
 from django.test import override_settings
 
 from rest_framework import serializers, status, versioning
+from rest_framework.compat import include
 from rest_framework.decorators import APIView
 from rest_framework.relations import PKOnlyObject
 from rest_framework.response import Response
@@ -170,7 +171,7 @@ class TestURLReversing(URLPatternsTestCase):
     ]
 
     urlpatterns = [
-        url(r'^v1/', include(included, namespace='v1')),
+        url(r'^v1/', include(included, namespace='v1', app_name='v1')),
         url(r'^another/$', dummy_view, name='another'),
         url(r'^(?P<version>[v1|v2]+)/another/$', dummy_view, name='another'),
     ]
@@ -335,8 +336,8 @@ class TestHyperlinkedRelatedField(URLPatternsTestCase):
     ]
 
     urlpatterns = [
-        url(r'^v1/', include(included, namespace='v1')),
-        url(r'^v2/', include(included, namespace='v2'))
+        url(r'^v1/', include(included, namespace='v1', app_name='v1')),
+        url(r'^v2/', include(included, namespace='v2', app_name='v2'))
     ]
 
     def setUp(self):
@@ -367,7 +368,7 @@ class TestNamespaceVersioningHyperlinkedRelatedFieldScheme(URLPatternsTestCase):
     ]
     included = [
         url(r'^namespaced/(?P<pk>\d+)/$', dummy_pk_view, name='namespaced'),
-        url(r'^nested/', include(nested, namespace='nested-namespace'))
+        url(r'^nested/', include(nested, namespace='nested-namespace', app_name='nested-namespace'))
     ]
 
     urlpatterns = [