fix ruby rev-list implementation not handling array of refs
fix ruby rev-list implementation not handling array of refs

isabanin/grit,gitcafe-dev/grit,HrishikeshSingh/testmodulerepo,gitcafe-dev/grit,isabanin/grit,rgroux/grit,mojombo/grit,brynary/grit,kevinsawicki/grit,brynary/grit,abicky/grit,patientslikeme/grit,thommay/grit,HrishikeshSingh/testmodulerepo,flycutter/grit,rgroux/grit,gitlabhq/grit,kevinsawicki/grit,redronin/grit,flycutter/grit,github/grit,renatoramiro/grit,thommay/grit,gitlabhq/grit