Titles users
Users who have a title.

GET /v2/titles/:title_id/titles_users
Return all the titles users of the given Title

GET /v2/users/:user_id/titles_users
Return all the titles users of the given User

GET /v2/titles_users
Return all the titles users

GET /v2/titles_users/:id
Get a titles user

POST /v2/titles_users
Create a titles user

PATCH /v2/titles_users/:id
Update a titles user

PUT /v2/titles_users/:id
Update a titles user

DELETE /v2/titles_users/:id
Destroy a titles user