clarifies instructions in proxy challenge 

Also added a wikipedia link for complete beginners to read up on proxies and hapi's reply.proxy() ref.
Let me know if this is too much. Thanks.

It seems like you feel very passionately that these instructions help so I appreciate the feedback.  I ran a nodeschool myself and didn't have this same experience (though the 8080 port thing did mess up a few folks).  I am only trying to clean up stuff I've seen open a while and do what I can to get the exercises more consistent and up to date.   I will leave this suggestion alone as it seems that it did help you greatly with your exercises.  I wonder however if 99% dont know what it is or find it useful, maybe it adds more confusion than helps? The remaining 1% that might find this useful can simply go to the api docs.  Do you think maybe this should be dropped completely?