$ bundle install
$ rake setup_github_pages
Enter the read/write url for your repository
(For example, 'git@github.com:your_username/your_username.github.com):
! [rejected] master -> master (non-fast-forward) error: failed to push some refs to '*******************' hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Merge the remote changes (e.g. 'git pull') hint: before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help'for details.