Error in the gorilla example for walking the API

[sofianinho]

Hello,
Thanks for your project and contributions.

There is a problem with the example you gave in 'swag/examples/gorilla/main.go'. Indeed, the path with variable {id} do not work with gorilla if you api.walk using ColonPath (that's for gin). So the example for gorilla should be:

api.Walk(func(path string, endpoint *swagger.Endpoint) {
		h := endpoint.Handler.(http.HandlerFunc)
		router.Path(path).Methods(endpoint.Method).Handler(h)
})

The full example with this correction is in the pull request I just proposed.

Edit: the PR is #21

Thanks
Sofiane