Update Extras page in the docs to include Kramdown to fix #1313
Add brackets around sudo on Extras page
Change syntax highlighting to YAML on Extras page
Add generator-jekyllrb and grunt-jekyll to plugins page
Merge pull request #1330 from robwierzbowski/add-grunt-yeoman

Add generator-jekyllrb and grunt-jekyll to plugins page
Update history to reflect merge of #1328
Update history to reflect merge of #1330
Merge pull request #1318 from johnkhughes/master

Update Extras page in the docs
Update history to reflect merge of #1318
Update Quick-Start page to include reminder that all requirements must be installed for Jekyll to work. Fixes #1327.
Update history to reflect closing of #1327
Include an HTML file in Templates docs so as not to confuse - we don't automatically markdownify/textilize includes. Fixes #1303.
Update history to reflect closing of #1303