Remove validation concerns from form objects

* Create separate validation objects for each document type.
* Convert ManualDocumentForm to a simpledelegator -- avoids unexpected
  errors where it doesn't proxy through methods as expected

+ @bestie
Rename form objects view adapters
Remove inheritance from CoreDocumentValidator
Merge pull request #173 from alphagov/create-validator-wrappers-which-arent-form-objects

Remove validation concerns from form objects
Fix typo in republish script
Merge pull request #174 from alphagov/fix-republish-script-typo

Fix typo in republish script
Fix #update bug in DocumentMetadataDecorator

The extra attributes hash was completely replaced
on update with whatever was in the given hash.

This required the caller to provide all the
key/value pairs for the extra attributes or have
them wiped out. This was inconsistent with the
update behaviour of the other fields.
Merge pull request #175 from alphagov/fix-document-metadata-decorator

Fix #update bug in DocumentMetadataDecorator
Bump gds-sso to 9.3.0

Signon will start rejecting requests that don't include client_id in the
Near Future. Upgrading to 9.3.0 makes this app compatible before that
change happens.

This version of gds-sso has a dependency on multi_json 1.10.0, so bump
that too.
Merge pull request #176 from alphagov/bump-gds-sso

Bump gds-sso to 9.3.0
Use pluralised form for AAIB 'name'
Merge pull request #177 from alphagov/bug/correct-name-for-aaib-schema

Use pluralised form for AAIB 'name'
Fix bug where editing an invalid AAIB report 500'd

All pages which rerender a form need the model to be wrapped in a view
adapter, otherwise on validation failure we attempt to redisplay the
form, which then 500's.
Merge pull request #178 from alphagov/update-to-invalid-bugfix

Fix bug where editing an invalid AAIB report 500'd
Add required require to the wiring file

Add to_param method to attachment s.t. the rails helpers can pick up the
ID's correctly.
Merge pull request #179 from alphagov/add-require-to-wiring

Add required require to the wiring file
Reorder requires in wiring for clarity
Require ManualDocumentValidator in wiring
Require CmaCaseValidator in wiring
Merge pull request #180 from alphagov/bug/require-validator-in-wiring

Require MaunualDocumentValidator in wiring