Fixed Mouse and Keyboard device demos not acting in accordance with the HID specification for idle periods (thanks to Brian Dickman).

Removed support for endpoint/pipe non-control interrupts; these did not act in the way users expected, and had many subtle issues.

Demos/Device/MassStorage/MassStorage.c

@@ -387,9 +387,6 @@ ISR(ENDPOINT_PIPE_vect, ISR_BLOCK)
 	/* Check if the control endpoint has received a request */
 	if (Endpoint_HasEndpointInterrupted(ENDPOINT_CONTROLEP))
 	{
-		/* Clear the endpoint interrupt */
-		Endpoint_ClearEndpointInterrupt(ENDPOINT_CONTROLEP);
-
 		/* Process the control request */
 		USB_USBTask();