Implementing EntityDetail view as the new explorer app;
Added server-side rendering of client-side templates with pystache for indexability of results;
Implemented serializers for UI views
Fixed some translations, removed all "fuzzy" and added some new ones
Implemented parent, children, ancestors and descendants on SheetItem
Updated API SheetItem serializers to match UI SheetItem seralizers
Continue work on explorer app
Merge branch 'develop' of https://github.com/prjts/open-budget into develop