* Middleware overhaul!
- Remove unnecessary 'async' keywords from middleware functions
- Ensure all middleware functions we create have names
- Wrap the method contents of all async middleware functions in a try-catch+next(error) pattern
* Use asyncMiddleware wrapper instead of try-catch+next(error) pattern
* Remove unnecessary try-catch+next(error) pattern from context middleware
* Add middleware to timeout requests after a period
* Add halt-on-dropped-connection middleware to stop the middleware processing stack if the connection was already dropped
* Add a few strategic bail-out spots for dropped connections during the render-page middleware
* Handle 404s and HEAD requests earlier in the page rendering flow
* Add a few more strategic bail-out spots for dropped connections during the render-page middleware
* Add middleware to notice aborted requests
* Add a check for aborted requests into the isConnectionDropped logic
* Reformat comment for consistency
* Handle aborted requests correctly in the error handler
* Explicit returns for consistency
