Fix #277 -- Embeddable shop (#622)

* Vendor vue.js

* Refactor item_group_by_category to support vouchers

* Widget: Show product list

* Widget: free prices

* Widget: pictures and loading indicator

* Widget: First iframe steps

* Widget: Do not rerender iframe

* Widget: Error handling

* Improve widget

* Widget: localization tech

* Fix invoice style

* Voucher attribute and waiting list

* Add some iframe chrome

* First step to namespaced carts

* More isolation steps

* More cart isolation things

* More cart isolation things

* Mobile stuff

* Show cart on checkout pages

* PayPal and Stripe support

* Enable downloads

* Locale handling

* change text "save URL to this exact page"

* Widget: voucher redemption

* Widget: CSS

* CSS: Responsive

* Widget: CSS improvements

* Widget: Add embedding code generator

* Widget: Error messages and SSL check

* First tests

* Widget: tests

* Don't use IDs in widgets

* Widget: static files caching

src/pretix/control/urls.py

@@ -75,6 +75,7 @@ urlpatterns = [
         url(r'^settings/tax/(?P<rule>\d+)/$', event.TaxUpdate.as_view(), name='event.settings.tax.edit'),
         url(r'^settings/tax/add$', event.TaxCreate.as_view(), name='event.settings.tax.add'),
         url(r'^settings/tax/(?P<rule>\d+)/delete$', event.TaxDelete.as_view(), name='event.settings.tax.delete'),
+        url(r'^settings/widget$', event.WidgetSettings.as_view(), name='event.settings.widget'),
         url(r'^subevents/$', subevents.SubEventList.as_view(), name='event.subevents'),
         url(r'^subevents/(?P<subevent>\d+)/$', subevents.SubEventUpdate.as_view(), name='event.subevent'),
         url(r'^subevents/(?P<subevent>\d+)/delete$', subevents.SubEventDelete.as_view(),