API Server for the Self-Portrait Project backend

##Neccesary environment variables (.env)
DEBUG=spp-api:api:defaultErrorMiddleware
DATABASE_URL=postgres://user:pass@localhost:5000/
USE_PG_SSL=0 # 1 for production, unset or 0 otherwise
You'll want to configure FB_APP_ID and FB_APP_SECRET to point at your own
personal Facebook test app, to make sure you don't step on the toes of CircleCI,
staging, or another developer while your integration (Mocha) tests create and
tear down Facebook test users.
In production, we also want to set APNS_PRODUCTION_PASS.
##Install
$ npm install
##Test
$ mocha
##Deployment
CircleCI runs on each push to master. Heroku auto-deploys to staging whenever
CircleCI passes. Pipeline promotion downstream to production happens manually.