Merge pull request #572 from nikgul/udev #1

Job	Run time
build-book	1m 55s
build-f3discovery-chapter (05-led-roulette)	46s
build-microbit-chapter (05-led-roulette)	32s
build-f3discovery-chapter (06-hello-world)	28s
build-f3discovery-doc	1m 7s
build-microbit-chapter (07-uart)	38s
build-f3discovery-chapter (07-registers)	25s
build-microbit-chapter (08-i2c)	37s
build-microbit-doc	2m 12s
build-f3discovery-chapter (08-leds-again)	25s
build-microbit-chapter (09-led-compass)	33s
build-f3discovery-chapter (09-clocks-and-timers)	23s
build-microbit-chapter (10-punch-o-meter)	37s
build-f3discovery-chapter (11-usart)	29s
build-f3discovery-chapter (14-i2c)	23s
build-f3discovery-chapter (15-led-compass)	24s
build-f3discovery-chapter (16-punch-o-meter)	23s
	12m 17s

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