Central Server

- Added support for running a centralized server over both HTTPS and
  HTTP, in an attempt to more-easily create production environments.
- Added new commands to add projects to the central server for hosting.
- Old 'server' and 'ssl' commands remain, but have been upgraded under
  the hood.
- Added new start, stop, restart, and status commands for the central
  server.

Change-Id: I821c7cdfa4d58c7af22cf7f508298b8546da05ce