title: how can i get user notifications with the new Graph API
body: <p>im making switch to the new Graph API , and i try to replace all the rest api with the new Graph api
  reading the docs i saw i have some kind of real time function ( im not sure its related to getting the user
  notifications ) that suppose to return me callback .
  but im my case i like to invoke simple http command and get the user notification like ( like the old notification api's )
  how can i do it now ?
  Thanks</p>