Added NOMIS IDs to all prisons.

[#77962164]
Custom ID requirements are determined based on the NOMIS ID of each prison.

[#77962164]
Added a layer of indirection for ID requirements templates.

[#77962164]
Merge pull request #93 from ministryofjustice/id-reqs-77962164

Customisable ID requirements for certain prisons
Prefix single digit numbers with zero
Merge pull request #96 from ministryofjustice/zero-padded-83560630

Prefix single digit numbers with zero
WIP all possible canned responses
Use GOV.UK Elements styles

* block-label
* panel-indent
Change appearance of block labels when interacting
Show details of response conditionally
Added help content to processing form
Tidy layout of processing form
Make GOVUK resources more visible
Fix IE6 block inputs
Add booking calendar to processing form
Processing form update copy and merge visiting allowance
Fix visitor clickable labels
Amend calendar mark-up to centre radio buttons
Accept processing form submission when no fields selected
Add VO reference number to confirmation email