Small bug fixes and my own implementation of webdav.Dir

Former-commit-id: 7a3c55bea22252b404430c5fa5fff9272dde87fd [formerly a5fa2aedbc584606fc5c114689df1f993640ff2d] [formerly c9a062d45c7560bd71b9362ce02cbe7a95273399 [formerly a753247333]]
Former-commit-id: 920069815b8425641cf2c13f95f3d69b6980b901 [formerly 89b7604b2f2569bcd177b90972ef53738a6777b6]
Former-commit-id: 4230d8c5f7b18f0668b207ffe44a74882808cab8

filemanager.go

@@ -11,8 +11,8 @@ import (
 
 	rice "github.com/GeertJohan/go.rice"
 	"github.com/asdine/storm"
+	"github.com/hacdias/filemanager/dir"
 	"github.com/mholt/caddy"
-	"golang.org/x/net/webdav"
 )
 
 var (
@@ -74,7 +74,7 @@ type User struct {
 	Admin bool `json:"admin"`
 
 	// FileSystem is the virtual file system the user has access.
-	FileSystem webdav.Dir `json:"filesystem"`
+	FileSystem dir.Dir `json:"filesystem"`
 
 	// Rules is an array of access and deny rules.
 	Rules []*Rule `json:"rules"`
@@ -134,7 +134,7 @@ var DefaultUser = User{
 	Rules:         []*Rule{},
 	CSS:           "",
 	Admin:         true,
-	FileSystem:    webdav.Dir("."),
+	FileSystem:    dir.Dir("."),
 }
 
 // New creates a new File Manager instance. If 'database' file already