List commits on a repo - based on #47
List commits on a repo - based on #47

Shows commits for a repo, depending on optional params
Removed note about author as that doesn't seem to be an option and
swapped order of options & cb
(to be consistent with read of this lib's API)
Closes #47

adjohnson916/github,cassioscabral/github,baoshan/github,weflex/octop,michael/github,mushishi78/github,esironal/github,firehist/github,yorkie/github-1,arosenberg01/github,w35l3y/github-js,michael/github,amenadiel/github,github-tools/github,iamdanfox/github,yaoxiaoyong/github-1,JensLincke/github,github-tools/github,kfoss/github,kustomzone/github,lucusp/github,cassioscabral/github,petrosh/github,aendrew/github,github-tools/github,jedfoster/github,bankonme/github,rschindlauer/github,teresakrause/github,camptocamp/github,jabez128/github,w35l3y/github-js,cmfcmf/github,sultanshakir/github,jenbennings/github,vmolsa/github,lukeburns/github,mcanthony/github,yuya-takeyama/github,kidaa/github,cassioscabral/github,michael/github