deleted classes CheckPrinter, Modem, TemperatureSensor, VideoControl
Merge pull request #2 from KatyaBondarenko/update2

deleted classes CheckPrinter, Modem, TemperatureSensor, VideoControl
deleted classes BadBillsContainer, BillsScanner, Cassette, DispenserController, and new file CheckPrinter
Merge pull request #3 from KatyaBondarenko/update3

Update3