code: public StorageRef isAuthenticated(String authenticationToken, OnBooleanResponse onBooleanResponse, OnError onError){
  		PostBodyBuilder pbb = new PostBodyBuilder(context);
  		Rest r = new Rest(context, RestType.ISAUTHENTICATED, pbb, null);
  		r.onError = onError;
  		r.onBooleanResponse = onBooleanResponse;
  		r.rawBody = "{\"applicationKey\":\""+context.applicationKey+"\", \"authenticationToken\":\""+authenticationToken+"\"}";
  		context.processRest(r);
  		return this;		
  	}
docs: Checks if a specified authentication token is authenticated.
  
  <pre>
  StorageRef storage = new StorageRef("your_app_key", "your_token");
  
  storage.isAuthenticated("authToken",new OnBooleanResponse() {
  &#064;Override
  public void run(Boolean aBoolean) {
  Log.d("StorageRef", "Is Authenticated? : " + aBoolean);
  }
  }, new OnError() {
  &#064;Override
  public void run(Integer integer, String errorMessage) {
  Log.e("StorageRef","Error checking authentication: " + errorMessage);
  }
  });
  </pre>
  
  @param authenticationToken
  The token to verify.
  @param onBooleanResponse
  The callback to call when the operation is completed, with an argument as a result of verification.
  @param onError
  The callback to call if an exception occurred
  @return Current storage reference