Now Pinry will not care type of url, if it could be input, it could be
saved.
This may cause xss issue but Pinry is a private pin-board replacement,
so be it.

New version of django fix the RuntimeError while saving wepb file.

The patch will not be applied to Django 1.8

Ref: https://www.djangoproject.com/download/#supported-versions

Ref: https://github.com/django/django/pull/10331

This commit fixes an issue where the `tags` key of pins in the API response would be serialized as the string `"<map object at 0x...>". This issue would cause a `TypeError: pins.objects[i].tags.sort is not a function` on the frontend and prevent the page from loading.