Refactor Post#to_liquid
Refactor Post#related_posts to build the index in a different method
The call to Post#read_yaml was in an unnecessary begin...rescue block.
Refactored setting of Post.published flag
Refactor Post category instantiation
Renamed tag- and category-instantiation methods
Remove unnecessary self.tags.flatten! in favour of a one-line sol'n.
Post#is_published ~> Post#published?
'The Best of Both Worlds,' à la @chad's comment
Merge pull request #1002 from mojombo/refactor-post

Refactor Jekyll::Post