Add Wagtail CMS for kfet app.

K-Fêt
- Integrate wagtail to serve "static" pages of old K-Fêt website
- Fixture "kfetcms/kfet_wagtail_17_05" contains a copy of old website
(as in May 2017).
- Media files can be got until end of June 17 at
http://partage.eleves.ens.fr//files/604e6dea2ceebc66b1936c6b3f911744/kfet_media.tar.gz

Login/logout
- Update package django_cas_ng to last version.
- Clean COFCASBackend.
- Change CAS version to 3 (version used on eleves.ens). This enables
the logout redirection (for CAS ofc).
- Add messages and clean existing ones on login/logout (for both
outsider and cas users).

Misc
- Update settings to bypass an incompability between debug-toolbar and
wagtailmenus packages.
- Better management of dev/test-specific urls (if debug-toolbar wasn't in
INSTALLED_APPS, media files were not served).
- UI improvements.

cof/urls.py

@@ -14,6 +14,10 @@ from django.views.generic.base import TemplateView
 from django.contrib.auth import views as django_views
 from django_cas_ng import views as django_cas_views
 
+from wagtail.wagtailadmin import urls as wagtailadmin_urls
+from wagtail.wagtailcore import urls as wagtail_urls
+from wagtail.wagtaildocs import urls as wagtaildocs_urls
+
 from gestioncof import views as gestioncof_views, csv_views
 from gestioncof.urls import export_patterns, petitcours_patterns, \
     surveys_patterns, events_patterns, calendar_patterns, \
@@ -48,7 +52,7 @@ urlpatterns = [
     url(r'^outsider/login$', gestioncof_views.login_ext),
     url(r'^outsider/logout$', django_views.logout, {'next_page': 'home'}),
     url(r'^login$', gestioncof_views.login, name="cof-login"),
-    url(r'^logout$', gestioncof_views.logout),
+    url(r'^logout$', gestioncof_views.logout, name="cof-logout"),
     # Infos persos
     url(r'^profile$', gestioncof_views.profile),
     url(r'^outsider/password-change$', django_views.password_change),
@@ -82,6 +86,8 @@ urlpatterns = [
     url(r'^utile_cof/diff_cof$', gestioncof_views.liste_diffcof),
     url(r'^utile_bda/bda_revente$', gestioncof_views.liste_bdarevente),
     url(r'^k-fet/', include('kfet.urls')),
+    url(r'^cms/', include(wagtailadmin_urls)),
+    url(r'^documents/', include(wagtaildocs_urls)),
 ]
 
 if 'debug_toolbar' in settings.INSTALLED_APPS:
@@ -90,7 +96,13 @@ if 'debug_toolbar' in settings.INSTALLED_APPS:
         url(r'^__debug__/', include(debug_toolbar.urls)),
     ]
 
+if settings.DEBUG:
     # Si on est en production, MEDIA_ROOT est servi par Apache.
     # Il faut dire à Django de servir MEDIA_ROOT lui-même en développement.
     urlpatterns += static(settings.MEDIA_URL,
                           document_root=settings.MEDIA_ROOT)
+
+# Wagtail for uncatched
+urlpatterns += [
+    url(r'', include(wagtail_urls)),
+]