Grit::Index#commit with hash params defaults head to nil
Grit::Index#commit with hash params defaults head to nil

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