added hackernews section and jx.js lightweight ajax library

Hey, I found this boilerplate extremely helpful, this is my first day w/ iOS dev and this code made a huge difference. Thanks so much for putting this up. I added some code to show how to connect to a third-party API. I tried using Angular's $http functions and they weren't working, so I tried using jQuery which significantly affected the performance of my app. I found a library called jx.js to do my http requests, which is < 1KB and works great.

Thought I'd share!

josh