Started read capability for USBPIO
Reading back from USB successfully. Returned message is ended by
'\r', preventing current printing. Fixme.
Merge remote-tracking branch 'origin' into readIO

Conflicts:
	test
	user-space-test.c
Added hotfix for string return from pio_read.
Merge remote-tracking branch 'origin/readIO'

Conflicts:
	test
	user-space-test.c