Merge pull request #22 from Financial-Times/notify

Notifications
Merge pull request #23 from Financial-Times/inject-db

Inject db & public list of users
Merge pull request #24 from Financial-Times/lists-model

Lists model
Merge pull request #25 from Financial-Times/topic-response

More useful topic response
Merge branch 'master' of github.com:Financial-Times/next-user-preferences-api into schema