gh-pages

1. gh-pages 브랜치 생성
2. setting pages 설정
3. https://stackoverflow.com/questions/32056324/there-is-no-tracking-information-for-the-current-branch

$ git pull origin master
$ git branch --set-upstream-to=origin/master master
$ git pull

$ git branch -u origin/master
Branch 'master' set up to track remote branch 'master' from 'origin'.