Updated imports of reverse and NoReverseMatch for Django 2.0

Regards #687

crispy_forms/tests/test_form_helper.py

@@ -7,7 +7,6 @@
 
 import django
 from django import forms
-from django.core.urlresolvers import reverse
 from django.forms.models import formset_factory
 from django.template import Context, Template, TemplateSyntaxError
 from django.test.html import parse_html
@@ -35,7 +34,11 @@
 except ImportError:
     from django.middleware.csrf import _get_new_csrf_string as _get_new_csrf_key
 
-
+try:
+    from django.urls import reverse
+except ImportError:
+    # Django < 1.10
+    from django.core.urlresolvers import reverse
 
 
 def test_inputs(settings):

crispy_forms/tests/test_layout.py

@@ -5,7 +5,6 @@
 
 import django
 from django import forms
-from django.core.urlresolvers import reverse
 from django.forms.models import formset_factory, modelformset_factory
 from django.shortcuts import render_to_response
 from django.template import Context, Template
@@ -33,6 +32,12 @@
 except ImportError:
     from django.middleware.csrf import _get_new_csrf_string as _get_new_csrf_key
 
+try:
+    from django.urls import reverse
+except ImportError:
+    # Django < 1.10
+    from django.core.urlresolvers import reverse
+
 
 def test_invalid_unicode_characters(settings):
     # Adds a BooleanField that uses non valid unicode characters "ñ"
@@ -595,4 +600,3 @@ def test_bootstrap4_form_inline():
     assert html.count('id="div_id_email" class="form-group"') == 1
     assert html.count('placeholder="email"') == 1
     assert html.count('</label> <input') == 3
-

docs/form_helper.rst

@@ -50,7 +50,7 @@ Helper attributes you can set
 
     Sometimes you may want to add arguments to the URL, for that you will have to do in your view::
 
-        from django.core.urlresolvers import reverse
+        from django.urls import reverse
         form.helper.form_action = reverse('url_name', args=[event.id])
         form.helper.form_action = reverse('url_name', kwargs={'book_id': book.id})