`telegram` module. Closes#2#7.
Two service classes:
* `Notifier` class
* `CommandProcessor` class
Two [middlewares](https://github.com/eternnoir/pyTelegramBotAPI/tree/master/examples/middleware):
* `UserAuthMiddleware`
* `ExceptionHandlerMiddleware`
One exception for usage in the code called by the bot:
* `DisplayableException`
Merge **ONLY** after #9 is merged.
Reviewed-on: #10
Reviewed-by: Miroslavsckaya <miroslavsckaya@noreply.git.skobk.in>
