Enable payments

- [x] confirmation page per notable
- [x] reinstate payments
- [x] do not submit claim if payment is declined or cancelled
- [x] increment fee group reference on declined or cancelled payment so 
- [ ] style confirmation page
- [ ] style payment jump page
I think we can hide the details of the file uploaders on the Claim class. 
In the xml generation I've wrapped attachments in something like (on Claim)

```ruby
def attachments
  self.class.uploaders.keys.map(&method(:send))
end`