By setting the `highlighter` setting to `rouge` you can now easily
highlight your code with it instead of relying on Pygments. However,
Jekyll doesn't depend on Rouge explicitly, you will need to install it
or add it to your Gemfile.
The documentation has been updated accordingly.
Rename the pygments configuration option to highlighter to allow
different highlighters in the future. For now, the allowed values are
`pygments` and `null`.
It's now more straightforward to plug another syntax highlighter.
Valery Tolstov
Robin Dupret
Roland Warmerdam
Parker Moore
Tom Bell
Tom Preston-Werner
Michishige Kaito
MattHall