WIP
Finish Enumerable vs. Relation post
Merge branch '17-difference-empty-none' into source
Finish Enumerable vs. Relation post
Merge branch '17-difference-empty-none' into source
Finish Enumerable vs. Relation post
Merge branch '17-difference-empty-none' into source

Conflicts:
	source/_posts/2014-10-23-the-big-difference-between-empty-and-none.markdown
WIP
Finish post, remove artifacts
Finish sed find-and-replace post