(refactor) Format created_by and discovered_by as foreign keys for later Mongoose population
(refactor) Format stached_created and staches_discovered as foreign keys for later Mongoose population
(cleanup) Remove method rendered negligible since now using Mongoose .populate, add refactor comments
(refactor) Implement native Mongoose method .populate for mapping stache ids to staches, remove methods thus rendered negligible, add refactor comments
Merge pull request #127 from jaredscheib/master

refactor/ Replace stache map methods with native Mongoose populate, add refactor comments, general cleanup