Messages route now handles database mutations.
Implemented message get route.
AJAX update homepage.

Nearly. Need to render the JSON updates through markdown for it to be
really complete.
Sort messages by most recent first.
Render markdown before sending JSON update.
Nicer UTC time formatting in JSON response.
Cleaned up and fixed warnings.
Return entire message object in new message post.
Can parse with the easier format string now.
Conciseness.