Link error messages to web help page

[caojohnny]

Create a lookup class that would convert an ID to a message, and provide a link in the error message to the website explaining the error and some usual scenarios.

[nickrobson]

I'm thinking that this could easily be done on this GitHub repo's wiki.

Perhaps errors / [error code] for ease of programming?

Otherwise we could enumerate error codes inside the server's code, and use pretty links for them.