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.

Added tests to route nickname processing.
Merge tag 'v1.5.2'

1.5.2

 * model-helper: ignore unknown property types (Miroslav Bajtoš)
Merge pull request #73 from STRML/nickname

Remove model name from nickname, swagger spec understands op context.
v1.6.0
Merge branch 'release/1.6.0' into production