Add group

[GoWebProd]

Usage:

group := &fasthttprouter.Group{}
group.Handle("POST", "/auth", api.handleAuthorization)

router := fasthttprouter.New()
router.Group("/api/v1/", group)

Can request: /api/v1/auth

[coveralls]

Coverage decreased (-8.4%) to 91.299% when pulling 6300bd2 on GoWebProd:master into 28db72d on buaazp:master.

[coveralls]

Coverage decreased (-8.4%) to 91.299% when pulling 6300bd2 on GoWebProd:master into 28db72d on buaazp:master.

[savsgio]

Hi @GoWebProd,

The official fasthttp organization is maintaining this repo in https://github.com/fasthttp/router.

Thanks.

[buaazp]

Hi @GoWebProd
This is a useful feature for a router. What I concerned is it will break the original behavior. So can you add some unit tests and I will merge later.