Implement Better HTTP Usage Through-out Horizon (Status Codes, Content-Type Headers, Accept Headers, etc...)

We need to figure out, in a holistic manner, how, site-wide we would like to handle AJAX communication over HTTP.

We should stick to HTTP status codes and the standards for their use/meaning in responses.

We should use Content-Type back and forth to communicate what is being transferred in either direction.

We should use the Accept header on the back-end to determine HOW to render a response to specific requests.

This would mean that if someone wants to add support for XML, no new endpoints should need to be written in order to render a given URI in XML, one would just be able to set the request Accept header, and create a response formatter for that Accept format.