Luke Towers 9840ff228f
Support absolute redirects in the formcontroller
Supports absolute redirects being used in the FormController behaviour.

If the form_config.yaml specifies 
```twig
create:
    redirect: https://api.example.com/oauth/authorize
```
Then the behaviour will now properly redirect the user to the URL provided where previously it would redirect to a url along the lines of `october.example.com/backend/https://api.example.com/oauth/authorize`. Relative backend redirect URLs are unchanged.
2018-02-06 14:42:24 -06:00
..