➜ b git:(gh-pages) ✗ bundle update
➜ b git:(gh-pages) ✗ bundle exec jekyll servehttp://idratherbewriting.com/documentation-theme-jekyll/
### 4. Option 2: Build the Theme (with the github-pages gem)
If you are in fact publishing on Github Pages, leave the Gemfile and Gemfile.lock files in the theme.The Gemfile tells Jekyll to use the github-pages gem. However, note that you cannot use the normal jekyll serve command with this gem due to dependency conflicts between the latest version of Jekyll and Github Pages (which are noted briefly here).
You need Bundler to resolve these dependency conflicts. Use Bundler to install all the needed Ruby gems:
Then always use this command to build Jekyll:
bundle exec jekyll serve