Directory client

This is an implementation for using the directory from the discovery project. It contains an api endpoint (/search), the directory client, and human models/views for interfacing with the server. I can change this to a WIP if you want to review and do some back and forth here. 
I tried to follow what conventions I could see in the project in terms of how views and pages were setup. Mostly mimicked your style since I am not very familiar with the intricacies of HumanView.
Also updated the readme to include settings needed to hit the directory.