Release 2.2.0
Use site.docs instead of site.pages.
Move to Sass.
Rearrange _config.yml
Merge pull request #2651 from jekyll/site-on-2-0
Update history to reflect merge of #2651 [ci skip]
chdir into site/_docs to update history. [ci skip]
Don't require the `scope` key in front matter defaults

Set defaults for `scope` in front matter defaults as per #2656
Replace deprecated Ruby methods

Replace `Hash#has_key?` and `File.exists?` with `Hash#key?`
and `File.exist?`
add warning flag to note
Use .scss for site_template styles.
Fix broken links now that docs is a collection in site.
Be more ambiguous about 'page.content'. But more transparent.

Fixes #2522.
Update history to reflect closing of #2522.
fix warning flag (move from wrong note)
Only include lib files in the gem

Resolves https://github.com/jekyll/jekyll/issues/2670
add back info class
Update to a better, more gitty way
Merge pull request #2671 from gjtorikian/patch-1
Update history to reflect merge of #2671 [ci skip]