Remove model name from nickname, swagger spec understands op context.

This removes the redundancy from paths in swagger-ui such as
`/api/user/user_login`. It will now be displayed simply as
`/api/user/login`.

This is consistent with how `nickname` is used in Swagger examples.
Should this match the beginning of the string?

What is the purpose of the question mark after `.*`? `.*` is "0 or more characters", with `?` it reads like "0 or more characters or nothing".

This seems more correct to me: `/^.*\./`