 
 private func properties(user user: User, prefix: String = "user_") -> [String:AnyObject] {
 
-  var properties = [String:AnyObject]()
+  var properties: [String:AnyObject] = [:]
 
   properties["uid"] = user.id
   properties["backed_projects_count"] = user.stats.backedProjectsCount

    }
    props["user_logged_in"] = loggedInUser != nil
    props["user_country"] = self.loggedInUser?.location?.country ?? self.config?.countryCode

    return props
  }

    props["app_version"] = self.bundle.infoDictionary?["CFBundleVersion"]
    props["app_release"] = self.bundle.infoDictionary?["CFBundleShortVersionString"]
    props["model"] = Koala.deviceModel
    props["distinct_id"] = self.distinctId
    props["device_fingerprint"] = self.distinctId
    props["iphone_uuid"] = self.distinctId
    props["os"] = self.device.systemName
    props["os_version"] = self.device.systemVersion
    props["screen_width"] = UInt(self.screen.bounds.width)
    props["screen_height"] = UInt(self.screen.bounds.height)
    props["device_orientation"] = Koala.deviceOrientation
    props["preferred_content_size_category"] = UIApplication.sharedApplication().preferredContentSizeCategory

    props["koala_lib"] = "iphone"

