Añado paquetes de confirmación. Corrijo bug en borrado de imágenes.

 On branch issue_38
 Changes to be committed:

	modified:   testing/virtualMachineServerTester.py
	modified:   virtualMachineServer/networking/packets.py
	modified:   virtualMachineServer/reactor/vmServerReactor.py
	modified:   virtualMachineServer/threads/compressionThread.py
	modified:   virtualMachineServer/threads/fileTransferThread.py