support modules design!

// the follow code is write in modules:
// GR:=NewGroupRouters()
// GR.AddRouter("/login",&UserController,"get:Login")
// GR.AddRouter("/logout",&UserController,"get:Logout")
// GR.AddRouter("/register",&UserController,"get:Reg")
// the follow code is write in app:
// import "github.com/beego/modules/auth"
// AddRouterGroup("/admin", auth.GR)

@@ -16,10 +16,60 @@ const VERSION = "1.0.1"
 type hookfunc func() error //hook function to run
 var hooks []hookfunc       //hook function slice to store the hookfunc
 
-func init() {
-	hooks = make([]hookfunc, 0)
-	//init mime
-	AddAPPStartHook(initMime)
+type groupRouter struct {
+	pattern        string
+	controller     ControllerInterface
+	mappingMethods string
+}
+
+// RouterGroups which will store routers
+type GroupRouters []groupRouter
+
+// Get a new GroupRouters
+func NewGroupRouters() GroupRouters {
+	return make([]groupRouter, 0)
+}
+
+// Add Router in the GroupRouters
+// it is for plugin or module to register router
+func (gr GroupRouters) AddRouter(pattern string, c ControllerInterface, mappingMethod ...string) {
+	var newRG groupRouter
+	if len(mappingMethod) > 0 {
+		newRG = groupRouter{
+			pattern,
+			c,
+			mappingMethod[0],
+		}
+	} else {
+		newRG = groupRouter{
+			pattern,
+			c,
+			"",
+		}
+	}
+	gr = append(gr, newRG)
+}
+
+// AddGroupRouter with the prefix
+// it will register the router in BeeApp
+// the follow code is write in modules:
+// GR:=NewGroupRouters()
+// GR.AddRouter("/login",&UserController,"get:Login")
+// GR.AddRouter("/logout",&UserController,"get:Logout")
+// GR.AddRouter("/register",&UserController,"get:Reg")
+// the follow code is write in app:
+// import "github.com/beego/modules/auth"
+// AddRouterGroup("/admin", auth.GR)
+func AddGroupRouter(prefix string, groups GroupRouters) *App {
+	for _, v := range groups {
+		if v.mappingMethods != "" {
+			BeeApp.Router(prefix+v.pattern, v.controller, v.mappingMethods)
+		} else {
+			BeeApp.Router(prefix+v.pattern, v.controller)
+		}
+
+	}
+	return BeeApp
 }
 
 // Router adds a patterned controller handler to BeeApp.
@@ -151,3 +201,9 @@ func Run() {
 
 	BeeApp.Run()
 }
+
+func init() {
+	hooks = make([]hookfunc, 0)
+	//init mime
+	AddAPPStartHook(initMime)
+}