Refactor to use nested VError for error handling

[dmitrizagidulin]

Enhance the error handling mechanism to use embedded causal chains of VErrors (see this excellent Joyent blog post on Error Handling in Node.js) and the corresponding https://github.com/joyent/node-verror library.

Also, consider using the Boom package for HTTP error handling (though size is a concern - check to see how much weight these libs will add to the Webpack'd bundle).

[dmitrizagidulin]

Hmm, maybe not. Including verror adds 43kb to the bundled lib. Worth it on the server side, but definitely not on the browser side.

[dmitrizagidulin]

On the other hand, the excellent standard-http-error lib only adds 2kb, so consider a nested chain of those, instead.

[dmitrizagidulin]

Whoa. And boom adds 300kb to the Webpack'd bundle! Definitely server-side-only.

[jonassmedegaard]

looking at the larger stack for solid-server, I notice that standard-http-error even if not big is used only in this library.

Just skimming names it seems http-errors is the module generally used. If I guess correctly that it provides equivalent functionality then perhaps it makes sense to instead refactor to use that.