Install GitHub Pages Gem
Install GitHub Pages Gem

"GitHub have provided the github-pages gem which is used to manage
Jekyll and its dependencies on GitHub Pages. Using it means that
when you deploy your site to GitHub Pages, you will not be caught
by unexpected differences between various versions of the gems."

See:
http://jekyllrb.com/docs/github-pages/
https://help.github.com/articles/using-jekyll-with-pages/

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