url(r'^user/(?P<username>[^/]+)/$', 'user', name='catalogue_user'),
url(r'^users/$', 'users', name='catalogue_users'),
url(r'^activity/$', 'activity', name='catalogue_activity'),
+ url(r'^activity/(?P<isodate>\d{4}-\d{2}-\d{2})/$',
+ 'activity', name='catalogue_activity'),
url(r'^upload/$',
'upload', name='catalogue_upload'),