Migrating to convict for managing configs. Fixes #14

Sorry for the size of the patch. It does the following:

* Adds `convict` fixes Issue #14 
* Moves config.json to local.json
* Creates `production.json` and `aws.json`
* Sets up awsbox to run with production.json and aws.json
* Automatically sets `verification_audience` based on the `public_url` Fixing Issue #35 
* Fix formatting of source files I was touching anyways