fix #163

you can set the delimiter like this

beego.TemplateLeft="{#"
beego.TemplateRight="#}"

or can set the config file like app.ini

templateleft={#
templateright=#}

beego.go

@@ -48,6 +48,8 @@ var (
 	EnableXSRF           bool
 	XSRFExpire           int
 	CopyRequestBody      bool //When in raw application, You want to the reqeustbody
+	TemplatLeft          string
+	TemplatRight         string
 )
 
 func init() {
@@ -78,6 +80,8 @@ func init() {
 	ErrorsShow = true
 	XSRFKEY = "beegoxsrf"
 	XSRFExpire = 60
+	TemplatLeft = "{{"
+	TemplatRight = "}}"
 	ParseConfig()
 	runtime.GOMAXPROCS(runtime.NumCPU())
 }