Allow filtering publications by location, and ordering by name

Add locale-aware ordering by name to WorldLocation and make use of it where we were doing things manually before (or not sorting at all).  Then add the existing location filtering UI to the publications index.

Ordering fixes: https://www.pivotaltracker.com/story/show/43776481
Filtering implements: https://www.pivotaltracker.com/story/show/42431695