Add note about using the github-pages gem properly
Move it down a little
Make it a little nicer.
Merge branch 'ghp-gem' of github.com:jekyll/jekyll into ghp-gem

* 'ghp-gem' of github.com:jekyll/jekyll:
  Move it down a little
Merge pull request #2939 from jekyll/ghp-gem
Update history to reflect merge of #2939 [ci skip]