This hook is triggered on an individual 'request object' completing whether Elder.js is being used in the "build" or a "server" mode.

• Internally, Elder.js uses this hook to write html to the "public folder".
• Useful for uploading static html to s3 or another source.
• Could also be used to write the output of a route's "data" function file to help with client site routing if you were so inclined.
• This hook may also be used by plugins to clean up any request specific 'state' they have stored.
• By default Elder.js adds a hook here to all server requests that outputs how long the request took to generate. If you want to see detailed output from this hook set debug.speed = true in your config file.