func NewStatic(directory http.FileSystem) *Static {
	return &Static{
		Dir:       directory,
		Prefix:    "",
		IndexFile: "index.html",
	}
}
NewStatic returns a new instance of Static
package negroni
import (
	"net/http"
	"path"
	"strings"
)
type Static struct {
	Dir http.FileSystem
	Prefix string
	IndexFile string
}