Live reload for power users

[rednaxus]

Hey...

I've found a lot of cases when i'd like to be able to set up a live reload of config options, without restarting the instance, e.g.
nconf.onChange ->
do stuff

or even fancier:
nconf.onChange (changeset?)->
do stuff

this might be a handy feature as part of the core functionality...

[mmalecki]

Watching for config file changes is a bad idea due to number of reasons (sometimes you change a config but want to apply it during next restart).
See @bmeck's flatiron-http-config for a good solution to that problem.