added test for shift/rotate (needs way of creating buffer)
added test for shift/rotate (needs way of creating buffer)

Microsoft/pxt,switchinnovations/pxt,switch-education/pxt,Microsoft/pxt,playi/pxt,Microsoft/pxt,switch-education/pxt,switchinnovations/pxt,switch-education/pxt,Microsoft/pxt,switch-education/pxt,Microsoft/pxt,playi/pxt,switchinnovations/pxt,switchinnovations/pxt,playi/pxt,playi/pxt,switch-education/pxt