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/settings/common.py

@@ -56,6 +56,22 @@ INSTALLED_APPS = [
     'widget_tweaks',
     'custommail',
     'djconfig',
+    'wagtail.wagtailforms',
+    'wagtail.wagtailredirects',
+    'wagtail.wagtailembeds',
+    'wagtail.wagtailsites',
+    'wagtail.wagtailusers',
+    'wagtail.wagtailsnippets',
+    'wagtail.wagtaildocs',
+    'wagtail.wagtailimages',
+    'wagtail.wagtailsearch',
+    'wagtail.wagtailadmin',
+    'wagtail.wagtailcore',
+    'wagtail.contrib.modeladmin',
+    'wagtailmenus',
+    'modelcluster',
+    'taggit',
+    'kfet.cms',
 ]
 
 MIDDLEWARE_CLASSES = [
@@ -69,6 +85,8 @@ MIDDLEWARE_CLASSES = [
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
     'django.middleware.security.SecurityMiddleware',
     'djconfig.middleware.DjConfigMiddleware',
+    'wagtail.wagtailcore.middleware.SiteMiddleware',
+    'wagtail.wagtailredirects.middleware.RedirectMiddleware',
 ]
 
 ROOT_URLCONF = 'cof.urls'
@@ -87,6 +105,7 @@ TEMPLATES = [
                 'django.core.context_processors.i18n',
                 'django.core.context_processors.media',
                 'django.core.context_processors.static',
+                'wagtailmenus.context_processors.wagtailmenus',
                 'djconfig.context_processors.config',
                 'gestioncof.shared.context_processor',
                 'kfet.context_processors.auth',
@@ -143,9 +162,12 @@ LOGIN_URL = "cof-login"
 LOGIN_REDIRECT_URL = "home"
 
 CAS_SERVER_URL = 'https://cas.eleves.ens.fr/'
+CAS_VERSION = '3'
+CAS_LOGIN_MSG = None
 CAS_IGNORE_REFERER = True
 CAS_REDIRECT_URL = '/'
 CAS_EMAIL_FORMAT = "%s@clipper.ens.fr"
+
 AUTHENTICATION_BACKENDS = (
     'django.contrib.auth.backends.ModelBackend',
     'gestioncof.shared.COFCASBackend',
@@ -171,3 +193,9 @@ CHANNEL_LAYERS = {
 }
 
 FORMAT_MODULE_PATH = 'cof.locale'
+
+# Wagtail settings
+
+WAGTAIL_SITE_NAME = 'GestioCOF'
+WAGTAIL_ENABLE_UPDATE_CHECK = False
+TAGGIT_CASE_INSENSITIVE = True