beego:namespace support nest

ns := NewNamespace("/v3",
		NSAutoRouter(&TestController{}),
		NSNamespace("/shop",
			NSGet("/order/:id", func(ctx *context.Context) {
				ctx.Output.Body([]byte(ctx.Input.Param(":id")))
			}),
		),
	)
beego: dev mode print request router & pattern
beego:delete debug information
ignore nil time