Import error and CLI usage errors in the rest server code

[ross-spencer]

It looks like the imports changed and are now deeper set in the repository, and the CLI parsing library calls are now out of date.

[ericprud]

I had a pending request to factor shex.js into atomic packages, which I finally did in c3c24e8. The upside is that webapp loads in a quarter the time and it's easy to build apps that only have what you want. The down side is that ever file you were working with has moved someplace else (apologies for not having done this ages ago).

I think it may be most efficient to work from the built-in server in packages/shex-cli/validate (called with --serve http://localhost:1234/). I'm bring it back to life right now and will add tests to cli-test.js.

The validate script doesn't have as much code extraneous to acting as a validation server as you might think. There's stuff for reading from stdin and local files but --serve can leverage those if you want to e.g. provide a default schema against which to validate (effectively dedicating the schema included on the command line.

Ping me in gitter and we can look for a way to incorporate any features you've added.