 
 private let _internalServiceURL = "http://wwdc.guilhermerambo.me/index.json"
 private let _SharedStore = DataStore()
+private let _MemoryCacheSize = 500*1024*1024
+private let _DiskCacheSize = 1024*1024*1024
 
 class DataStore: NSObject {
     

                
                NSUserDefaults.standardUserDefaults().setURL(NSURL(string: appleURL)!, forKey: "Apple URL")
                NSUserDefaults.standardUserDefaults().synchronize()
                self.cachedAppleURL = NSURL(string: appleURL)!
                
                self.doFetchSessions(completionHandler)
            }).resume()

    }
    
    func doFetchSessions(completionHandler: fetchSessionsCompletionHandler) {
        session.dataTaskWithURL(appleSessionsURL!, completionHandler: { data, response, error in
            if data == nil {
                completionHandler(false, [])
                return
