copied files from local
stored fault injection session in task->fault. handled test cases outlined in doc
Merge branch 'hw4' of https://github.com/calvinhu4/coms4118 into hw4
Merge branch 'hw4' of https://github.com/calvinhu4/coms4118 into hw4
put_prev_task: handled prev->on_rq=0 case; runs a bit before stalling
Merge branch 'hw4' of https://github.com/calvinhu4/coms4118 into hw4