Allowing the app.postInitialize function acess to app.req object

This will allow for access to the app.req object server side inside of the app.postInitialize function.

```javascript 
AppBase.extend({
    postInitialize : function(){
       if (global.isServer) {
           if(this.req){
               console.log("we can see the headers")
           }
       }
    }
})