Merge commit '645219bfa68384dad930269b94e2ddf8b4cd3488' into api

diff --combined apps/catalogue/models.py
index ef923fa,4552962..34c1d0b
--- 1/apps/catalogue/models.py
--- 2/apps/catalogue/models.py
+++ b/apps/catalogue/models.py
@@@ -64,9 -64,6 +64,9 @@@ class Tag(TagBase)
      gazeta_link = models.CharField(blank=True, max_length=240)
      wiki_link = models.CharField(blank=True, max_length=240)
  
 +    created_at    = models.DateTimeField(_('creation date'), auto_now_add=True, db_index=True)
 +    changed_at    = models.DateTimeField(_('creation date'), auto_now=True, db_index=True)
 +
      categories_rev = {
          'autor': 'author',
          'epoka': 'epoch',
@@@ -223,8 -220,7 +223,8 @@@ class Book(models.Model)
      title         = models.CharField(_('title'), max_length=120)
      slug          = models.SlugField(_('slug'), max_length=120, unique=True, db_index=True)
      description   = models.TextField(_('description'), blank=True)
 -    created_at    = models.DateTimeField(_('creation date'), auto_now_add=True)
 +    created_at    = models.DateTimeField(_('creation date'), auto_now_add=True, db_index=True)
 +    changed_at    = models.DateTimeField(_('creation date'), auto_now=True, db_index=True)
      _short_html   = models.TextField(_('short HTML'), editable=False)
      parent_number = models.IntegerField(_('parent number'), default=0)
      extra_info    = JSONField(_('extra information'))
@@@ -562,7 -558,7 +562,7 @@@
                      tag.save()
                  book_tags.append(tag)
  
-         book.tags = book_tags + book_shelves
+         book.tags = set(book_tags + book_shelves)
  
          book_tag = book.book_tag()
  

diff --combined wolnelektury/urls.py
index 0d61a36,a99030f..932c440
--- 1/wolnelektury/urls.py
--- 2/wolnelektury/urls.py
+++ b/wolnelektury/urls.py
@@@ -25,6 -25,7 +25,7 @@@ urlpatterns = patterns(''
      url(r'^o-projekcie/$', 'infopages.views.infopage', {'slug': 'about_us'}, name='about_us'),
      url(r'^widget/$', 'infopages.views.infopage', {'slug': 'widget'}, name='widget'),
      url(r'^epub/$', 'infopages.views.infopage', {'slug': 'epub'}, name='epub'),
+     url(r'^zaproszenie/$', 'infopages.views.infopage', {'slug': 'invitation'}, name='invitation'),
      
      url(r'^1procent/$', 'django.views.generic.simple.direct_to_template', {
          'template': '1percent.html'
@@@ -36,7 -37,6 +37,7 @@@
      url(r'^admin/', include(admin.site.urls)),
  
      # Authentication
 +    url(r'^users/simple_login/$', 'catalogue.views.simple_login', name='simple_login'),
      url(r'^uzytkownicy/zaloguj/$', 'catalogue.views.login', name='login'),
      url(r'^uzytkownicy/wyloguj/$', 'catalogue.views.logout_then_redirect', name='logout'),
      url(r'^uzytkownicy/utworz/$', 'catalogue.views.register', name='register'),