Add the 'title' variable to collection permalinks
add class << self idiom to new command
Merge pull request #2817 from rusikf/patch-2
Update history to reflect merge of #2817 [ci skip]
Change :title to :name
Add Document#slug
Merge pull request #2799 from kansaichris/add-title-to-collection-permalinks
Update history to reflect merge of #2799 [ci skip]
Add note to datafiles docs around CSV's.

Ref: #2761