Update fake search to return organisation hashes
Update fake search to return organisation hashes

The new `search` endpoint will return a document's organisations as an array of
hashes, which will contain data such as an organisation's slug. This updates
NotQuiteAsFakeSearch to format organisations as a hash when returning search
results.

alphagov/whitehall,alphagov/whitehall,alphagov/whitehall,alphagov/whitehall