Multiple claimants:
  - Only recognise routes explicitly managed by ClaimTransitionManager.
    Before unrecognised routes would 500 because the corresponding
    form class didn't exist. Now 404.
  - Fix routes so that they're hyphenated, e.g. /apply/additional-information
    fixes #296
  - Forms always PUT to the same URL as for GET, e.g /apply/claimant
  - MultiplesController, a subclass of ClaimsController is used to
    support non-destructive addition of claimants
  - Allow a la carte destruction of addtional claimants
  - Destroy all additional claimants if the user chooses "No"
Multiple claimants:
  - Only recognise routes explicitly managed by ClaimTransitionManager.
    Before unrecognised routes would 500 because the corresponding
    form class didn't exist. Now 404.
  - Fix routes so that they're hyphenated, e.g. /apply/additional-information
    fixes #296
  - Forms always PUT to the same URL as for GET, e.g /apply/claimant
  - MultiplesController, a subclass of ClaimsController is used to
    support non-destructive addition of claimants
  - Allow a la carte destruction of addtional claimants
  - Destroy all additional claimants if the user chooses "No"
Copy updates

- a number of copy updates
- some template refactors
- updated tests to reflect changes

fixes #323
styled add additional person link/button
Updated package script to align with prefixed docker instances
added mulitple claimants ui changes
Merge pull request #329 from ministryofjustice/fixes/gh-issue-323

Copy updates
Merge pull request #334 from ministryofjustice/updated_package_script

Updated package script to align with prefixed docker instances
@cleargif fix for #319
Merge pull request #335 from ministryofjustice/frontend/issues-319

@cleargif fix for #319
added remove claimant link functionality.
fixed merge conflicts
Merge pull request #295 from ministryofjustice/feature/multiple-claimants

Add multiple claimants to the flow (WIP)
Major changes to Form:
- Form.attributes is gone. Replaced by Form.attribute, which takes
  the attribute name and the type user input should be cooerced to.
  Fixes #333.
- Abandon ActiveModel interface for `#initialize`. Forms now take
  a model instance as the only argument. We didn't use the AM
  interface anywhere in the code and made it possible for Forms
  to be incorrectly initialized, i.e. without a model instance.
- Promote `#target` to public method in all Form subclasses, it
  shouldn't have been private anyway.