title: External jQuery Library in typescript file
body: <p>i am working on an Asp.net MVC project with Smartadmin theme and Typescript with JQuery typings for Dom manipulation, there is a jquery library called SmartMessageBox for prompt messages ,is there an easy way to use this library inside my typescript file because i get 
  Error Build:Property 'SmartMessageBox' does not exist on type 'JQueryStatic'</p>