Homestyx hydra

R1:49063647515c

Add a JSON document rendering engine

Summary: Depends on D19254. This engine just formats JSON files in a nicer, more readable way.

Test Plan: Looked at some JSON files, saw them become formatted nicely.

Reviewers: mydeveloperday

Reviewed By: mydeveloperday

Differential Revision: https://secure.phabricator.com/D19255
Repository: R1 hydra
Commit Date: Mar 23 2018