Previously you just specified the regex as a string, now it expects a JSON
object with a 'regex' key and an 'exclusive' boolean, as per spec.

Fallback registration page: make the page autoresize on iPhone Safari/Webview

Fallback registration page: added the classic viewport meta to fix the display on iPhone Safari and webview. The width of input elements also needs to be fixed.

Registration fallback

Pull the _get_event_cache.setdefault() call out of the try block, as it doesn't need to be there and is confusing

Try to keep both forms of registration logic (native/fallback) close
together for sanity.