Merge branch 'release/4.0.4'

Conflicts:
	README.md

Merge branch 'feature/theme-gem' into develop

Update Gemfile

Swap `github-pages` gem with latest Jekyll
- Add Jekyll plugins

Merge branch 'release/3.3.5'

Merge branch 'feature/gemfile' into develop

Update Gemfile instructions

Disable gems in `_config.yml` and enable with bundler instead
- Add `repository` to `_config.yml` as part of GitHub metadata

Merge branch 'release/3.0.0'

Merge branch 'feature/visual-refresh' into develop

Add support for Jekyll Archives plugin
- Option to select GitHub Pages compatible tag/category page archive or plugin generated archives

Add WDM gem to properly enable auto-regeneration on Windows

Update gems

Merge branch 'feature/config-refactor' into develop

Clean-up `Gemfile`
- Remove gems already included with `github-pages`
- Remove Octopress, should be optional

Support Jekyll 3.0
- Update to Jekyll v3.0
- Switch from Pygments.rb to Rouge for syntax highlighting
- Minor updates to syntax.scss partial and theme documentation
- Include jekyll-gist gem
- Close #192, #218

Update gems

Merged improvement to post-index.html

Merge pull request #141 from cdodd/remove-whitespace

Remove trailing whitespace

Remove trailing whitespace