- GetExitApp(),command();

- constants.py:
  - added .json in list DOWN_FILE_EXT for my mime type;

  - SetEditListDevices()-> added if choise for naming of devices;
- ais_readers.html(3.1):
  - added new tags for naming of device;

- ais_readers.html:
  - replaced radio buttons with checkbox buttons in Ligts row;
- commands.py:
  - new construct for light choise;
  - added if statement in command() for exit function;

- commands.py:
  - command() -> call 'Q' and 'q' functions;

  - command() -> added ResBusyLoop();

- display some functions without devices exists;
- resolved some bugs;

- remove import threading module;

- combine lock_thread methods;

 - add the threading.Event () method to the communication between the troughs;

- adds the structure as a fleg that shows the RT function whether a function is in progress or not;

Merge branch 'master' of https://git.d-logic.net/nfc-rfid-reader-sdk/ais_readers-examples-web_api_src

- commands.py
  - fixed minor bugs;

- command():
  - new code for resource busy resolving;

- GetAISUpdateAndGetCount()
  - added return status if status !=DL_OK;
- added DeviceHandler() and ResBusyCheck();