add collection.label to Document#to_liquid
add label to document section of collections page
Remove `Command.globs` method

It is no longer being used.
Get relative paths of directories to ignore

Use `Pathname#realpath` to get absolute paths so that
`Pathname#relative_path_from` will not raise an exception. Also add the
config files to this list.
Add link to Jekyll Project Version Tag plugin
Merge pull request #2468 from rob-murray/add_link_to_version_plugin
Update history to reflect merge of #2468 [ci skip]
Externalize the {% gist %} tag as the jekyll-gist gem.
Test our RC1 of jekyll-gist.
Remove tests for gists.
Jekyll-gist 1.0. :boom:
Merge pull request #2469 from jekyll/extract-gist-tag
Update history to reflect merge of #2469 [ci skip]
add collection.label to Document#to_liquid
Merge branch 'documenttoliquid' of https://github.com/budparr/jekyll into documenttoliquid

Conflicts:
lib/jekyll/document.rb
Merge branch 'documenttoliquid' of https://github.com/budparr/jekyll into documenttoliquid
Use `https` for GitHub links.

The `http` links already redirect to `https` anyway.
change label to collection

To make it clear the label is of the document's collection
remove extra space
Merge pull request #2470 from XhmikosR/https