Add tags support

Set slugify to be global
Update modification date only if text has been changed
Fix a bug in preview (post_id was passed instead of blog_id)
Add Home, Category and Tag links in blog area instead of global area (dynastie template)
Fix a bug in Have_I_right

wsgi.py

@@ -18,7 +18,7 @@ import sys
 
 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "dynastie.settings")
 
-dynastie_root = '/home/soutade/dynastie/'
+dynastie_root = '/home/soutade/Projets_Perso/dynastie2/dynastie/'
 if dynastie_root not in sys.path:
     sys.path.append(dynastie_root)
 dynastie_root += 'dynastie/'