Merge pull request #487 from rjc123/newsites

Configure procurement.cabinetoffice.gov.uk for global archive
Allow Site.create to specify :redirector or :bouncer

* Defaults to :bouncer
Update rake task for environmental variable SITE_TYPE

* Governs what type of site gets generated:
    * data/sites/name.yml for redirector
    * data/transition-sites/name.yml for bouncer
Be accurate about location of new bouncer files
Don't create tests/mappings for bouncer sites
Merge pull request #489 from alphagov/bouncer-rake

Modify `new_site` to accept a SITE_TYPE parameter
Update new_site rake task to be more precise
Set a date for UKBA launch
Associate the UKBA sites with UKVI

UKVI has replaced UKVI for 90% of its function, so it is the most helpful place
to send users to if they hit a 404/410.

UKVI has no FURL at the time of writing.
Merge pull request #490 from alphagov/move_ukba_to_ukvi

Associate the UKBA sites with UKVI
Launch mappings for www.archive2.official-documents.gov.uk
Launch mappings for www.archive.official-documents.co.uk
Launch mappings for www.official-documents.gov.uk
Use more recent whitehall mappings file for munge
Include suggested links for NAO and Parliamentary Papers
Use most recent archive scrape for TNA OffDocs
Enable management of Official Docs in Transition App
Merge pull request #492 from rjc123/offdocs_to_transition

Moving OffDocs to be managed by transition
Revert "Enable management of Official Docs in Transition App"

This reverts commit 0bb83aa4bad8781b4f0540acd8c7501040de0f8e.
Merge pull request #493 from rjc123/offdocs_to_transition

Revert "Enable management of Official Docs in Transition App"